i7: the quest for 4.2GHz (R3F)

Skull_Angel

[H]ard|Gawd
Joined
May 31, 2010
Messages
1,664
hey all

as the title says I'm currently working towards 4.2GHz (hyperthreading enabled). current "stable" setting is 4GHz (blck 210x19), which I haven't fully stress tested (initial 20min linx test).

I've dicked around with the voltages a bit, but no dice yet. here's a template of my most stable 4.2GHz settings.

Code:
[U][B][SIZE="4"]Asus RampageIII Formula[/SIZE][/B][/U][B]
[SIZE="3"]Extreme Tweaker[/SIZE][/B]
Target CPU Frequency - 4200 MHz
Target Dram Frequency - 1600 MHz
LN2 Mode - Disabled
QPI Load Line Calibration - enabled
_____________________________________
[B]Extreme tweaker[/B]
Sync Mode..................................: Disabled
A1 Overclock Tuner......................: Manual
OC from CPU Level Up...................: Auto
CPU Ratio setting..........................: 21
CPU Turbo Power Limit..................: Disabled

[B]<CPU Configuration Sub Menu>[/B]
CPU Ratio setting..........................: 21
C1E Support.................................: Disabled
Hardware Prefetcher.....................: Enabled
Adjacent Cache  Line Prefetch.........: Enabled
MPS and ACPI MADT Ordering.........: Modern
Intel(r) Virtualization Tech...............: Enabled
CPU TM Function.............................: Disabled
Execute Disable Bit..........................: Enabled
Intel(r) HT Technology.....................: Enabled
Active Processor Cores.....................: All
A20M..............................................: Disabled
Intel(r) Speedstep(TM) Tech.............: Disabled
Intel(r) Turbo Mode Tech..................: Disabled
Intel(r) C State Tech*.......................: Disabled
*C State package limit setting............: Disabled
*C1 Auto Demotion...........................: Disabled
*C3 Auto Demotion...........................: Disabled
_____________________________________
[B]Extreme Tweaker(Continued)[/B]
BCLK Frequency.................................: 200
PCIE Frequency..................................: 103
Dram Frequency.................................: 1603
UCLK Frequency..................................: 3208
QPI Link Data Rate...............................: 7218
Memory Configuration Protect...............: Disabled

[B]<Dram Timing Configuration Sub Menu>[/B]

[B]1st Information[/B]
CAS# Latency (tCL).........................: 8
RAS# to CAS# Delay (tRCD).............: 8
RAS# PRE Time (tRP)......................: 8
RAS# ACT Time (tRAS)....................: 20
RAS# TO RAS# Delay.......................: 5 (Auto)
Ref Cycle Time.................................: 72 (A)
Write Recovery Time.........................: 8 (A)
Read to Pre Time..............................: 6 (A)
Four Act Win Time.............................: 24 (A)
Back to Back Cas# Delay.....................: 0 (A)

[B]2nd Information[/B]
Timing Mode......................................: 1N
Round trip Latency Channel A...............: 55 (A)
Round trip Latency Channel B................: 58 (A)
Round trip Latency Channel C................: 60 (A)

[B]3rd Information[/B]
Write to Read Delay (DD).......................: 7 (A)
Write to Read Delay (DR).......................: 7 (A)
Write to Read Delay (SR).......................: 18 (A)
Read to Write Delay (DD)........................: 9 (A)
Read to Write Delay (DR)........................: 9 (A)
Read to Write Delay (SR)........................: 9 (A)
Read to Read Delay (DD).........................: 7 (A)
Read to Read Delay (DS).........................: 6 (A)
Read to Read Delay (SR).........................: 4 (A)
Write to Write Delay (DD)........................: 7 (A)
Write to Write Delay (DR).........................: 7 (A)
Write to Write Delay (SR)..........................: 4 (A)

[B]Extreme Tweaker (Continued)[/B]
CPU Differential amplitude..........................: Auto
CPU Clock Skew.........................................: Auto
IOH Clock Skew..........................................: Auto

Extreme Engine Digi+..................................:
Digi+ Power Mode.......................................: T-Balance
PWM Voltage Control...................................: Auto
Load-Line Calibration...................................: Full
CPU Voltage OCP.........................................: Enabled
CPU PWM Frequency....................................: Auto
Extreme OV.................................................: Disabled
Extreme OC.................................................: Auto
CPU Voltage.................................................: 1.4v
CPU PLL Voltage............................................: 1.81525v
QPI/DRAM Core Voltage.................................: 1.3v
DRAM BUS Voltage.........................................: 1.60325v

[B]<Dram Reference Voltage Sub Menu>[/B]
DRAM DATA Ref. Ch.A.....................................: Auto
DRAM CTRL Ref. Ch.A......................................: Auto
DRAM DATA Ref. Ch.B......................................: Auto
DRAM CTRL Ref. Ch.B.......................................: Auto
DRAM DATA Ref. Ch.C.......................................: Auto
DRAM CTRL Ref. Ch.C.......................................: Auto

[B]Extreme Tweaker (Continued)[/B]
IOH Voltage......................................................: 1.23225v
IOH PCIE Voltage...............................................: 1.5105v
ICH Voltage.......................................................: 1.113v
ICH PCIE Voltage................................................: 1.5105v
CPU Spread Spectrum.........................................: Disabled
PCIE Spread Spectrum.........................................: Disabled

most of the error messages I get with above settings are 124, but when I start messing with QPI/vtt and/or IOH voltage it gets less stable.

kind of bothers me to see vCore needing such big jumps, but what ya gonna do :( . 3.8GHz passed quick tests at 1.225v (stock) very smoothly, as well as 4GHz at 1.3v with a bump to IOH voltage. I've tested stable blck up to 218 and stopped there since 220 was being more than a handfull.

if anyone has any suggestions, it would be appreciated.
 
Last edited:

Skull_Angel

[H]ard|Gawd
Joined
May 31, 2010
Messages
1,664
currently sticking to my 4GHz clock at 210x19. I've gotten 4.2GHz 1hr p95 stable, but quit at that point seeing temps in the higher mid-80s. I may try reseating my hsf later to see if temps change much, but don't expect much. I'll have to store the settings 'till I can upgrade cooling, it's unlikely that I'll reach the lower 80s sticking with air, but I do need a better set of push-pull fans so it's not impossible (currently running an off-brand set of 1600rpm fans).

last settings at 4.2GHz:

Code:
[U][B][SIZE="4"]Asus RampageIII Formula[/SIZE][/B][/U][B]
[SIZE="3"]Extreme Tweaker[/SIZE][/B]
Target CPU Frequency - 4200 MHz
Target Dram Frequency - 1600 MHz
LN2 Mode - Disabled
QPI Load Line Calibration - enabled
_____________________________________
[B]Extreme tweaker[/B]
Sync Mode..................................: Disabled
A1 Overclock Tuner......................: Manual
OC from CPU Level Up...................: Auto
CPU Ratio setting..........................: 21
CPU Turbo Power Limit..................: Disabled

[B]<CPU Configuration Sub Menu>[/B]
CPU Ratio setting..........................: 21
C1E Support.................................: Disabled
Hardware Prefetcher.....................: Enabled
Adjacent Cache  Line Prefetch.........: Enabled
MPS and ACPI MADT Ordering.........: Modern
Intel(r) Virtualization Tech...............: Enabled
CPU TM Function.............................: Disabled
Execute Disable Bit..........................: Enabled
Intel(r) HT Technology.....................: Enabled
Active Processor Cores.....................: All
A20M..............................................: Disabled
Intel(r) Speedstep(TM) Tech.............: Disabled
Intel(r) Turbo Mode Tech..................: Disabled
Intel(r) C State Tech*.......................: Disabled
*C State package limit setting............: Disabled
*C1 Auto Demotion...........................: Disabled
*C3 Auto Demotion...........................: Disabled
_____________________________________
[B]Extreme Tweaker(Continued)[/B]
BCLK Frequency.................................: 200
PCIE Frequency..................................: 103
Dram Frequency.................................: 1603
UCLK Frequency..................................: 3208
QPI Link Data Rate...............................: 7218
Memory Configuration Protect...............: Disabled

[B]<Dram Timing Configuration Sub Menu>[/B]

[B]1st Information[/B]
CAS# Latency (tCL).........................: 8
RAS# to CAS# Delay (tRCD).............: 8
RAS# PRE Time (tRP)......................: 8
RAS# ACT Time (tRAS)....................: 20
RAS# TO RAS# Delay.......................: 5 (Auto)
Ref Cycle Time.................................: 72 (A)
Write Recovery Time.........................: 8 (A)
Read to Pre Time..............................: 6 (A)
Four Act Win Time.............................: 24 (A)
Back to Back Cas# Delay.....................: 0 (A)

[B]2nd Information[/B]
Timing Mode......................................: 1N
Round trip Latency Channel A...............: 55 (A)
Round trip Latency Channel B................: 58 (A)
Round trip Latency Channel C................: 60 (A)

[B]3rd Information[/B]
Write to Read Delay (DD).......................: 7 (A)
Write to Read Delay (DR).......................: 7 (A)
Write to Read Delay (SR).......................: 18 (A)
Read to Write Delay (DD)........................: 9 (A)
Read to Write Delay (DR)........................: 9 (A)
Read to Write Delay (SR)........................: 9 (A)
Read to Read Delay (DD).........................: 7 (A)
Read to Read Delay (DS).........................: 6 (A)
Read to Read Delay (SR).........................: 4 (A)
Write to Write Delay (DD)........................: 7 (A)
Write to Write Delay (DR).........................: 7 (A)
Write to Write Delay (SR)..........................: 4 (A)

[B]Extreme Tweaker (Continued)[/B]
CPU Differential amplitude..........................: Auto
CPU Clock Skew.........................................: Auto
IOH Clock Skew..........................................: Auto

Extreme Engine Digi+..................................:
Digi+ Power Mode.......................................: T-Balance
PWM Voltage Control...................................: Auto
Load-Line Calibration...................................: Full
CPU Voltage OCP.........................................: Enabled
CPU PWM Frequency....................................: Auto
Extreme OV.................................................: Disabled
Extreme OC.................................................: Auto
CPU Voltage.................................................: 1.415v
CPU PLL Voltage............................................: 1.81525v
QPI/DRAM Core Voltage.................................: 1.3v
DRAM BUS Voltage.........................................: 1.51v

[B]<Dram Reference Voltage Sub Menu>[/B]
DRAM DATA Ref. Ch.A.....................................: Auto
DRAM CTRL Ref. Ch.A......................................: Auto
DRAM DATA Ref. Ch.B......................................: Auto
DRAM CTRL Ref. Ch.B.......................................: Auto
DRAM DATA Ref. Ch.C.......................................: Auto
DRAM CTRL Ref. Ch.C.......................................: Auto

[B]Extreme Tweaker (Continued)[/B]
IOH Voltage......................................................: 1.166v
IOH PCIE Voltage...............................................: 1.5105v
ICH Voltage.......................................................: 1.113v
ICH PCIE Voltage................................................: 1.5105v
CPU Spread Spectrum.........................................: Disabled
PCIE Spread Spectrum.........................................: Disabled
 

86 5.0L

Supreme [H]ardness
Joined
Nov 13, 2006
Messages
7,079
currently sticking to my 4GHz clock at 210x19. I've gotten 4.2GHz 1hr p95 stable, but quit at that point seeing temps in the higher mid-80s. I may try reseating my hsf later to see if temps change much, but don't expect much. I'll have to store the settings 'till I can upgrade cooling, it's unlikely that I'll reach the lower 80s sticking with air, but I do need a better set of push-pull fans so it's not impossible (currently running an off-brand set of 1600rpm fans).

you be fine at 4.2Ghz those temps are nothing ;) the i7 has a thermal cutoff point and you haven't even hit it yet
 

Skull_Angel

[H]ard|Gawd
Joined
May 31, 2010
Messages
1,664
you be fine at 4.2Ghz those temps are nothing ;) the i7 has a thermal cutoff point and you haven't even hit it yet

I know, but doing an 8 hr+ stability test at 87C doesn't really sit right with me, haha. from what I've heard 100C is where the chip will throttle its self, an' I'm well aware that these suckers can take the heat, I jus' don't like to take much of a chance when income isn't that great currently, lol.

later I'll be doing some OCing with HT disabled for more dedicated gaming performance, pretty sure I would be able to hit 4.4GHz and be able to keep temperatures within my safe zone, lol.
 

86 5.0L

Supreme [H]ardness
Joined
Nov 13, 2006
Messages
7,079
I know, but doing an 8 hr+ stability test at 87C doesn't really sit right with me, haha. from what I've heard 100C is where the chip will throttle its self, an' I'm well aware that these suckers can take the heat, I jus' don't like to take much of a chance when income isn't that great currently, lol.

later I'll be doing some OCing with HT disabled for more dedicated gaming performance, pretty sure I would be able to hit 4.4GHz and be able to keep temperatures within my safe zone, lol.

been at 4.0GHz+ for 1.5 years now, folding@4.1 for about half of that time, hit TJ maxx many many times, as long as the voltage is acceptable the i7 will take it :)
 

lehmann

[H]ard|Gawd
Joined
Feb 8, 2005
Messages
1,362
though my chip wont make 4.2 i have run high 80's low 90's for months on end. also 24/7 folding
 

Skull_Angel

[H]ard|Gawd
Joined
May 31, 2010
Messages
1,664
reapplied the hsf and started 4.2 stress testing last night, temps never rose above 85C so I'm pretty happy about that, lol. these cheapo 1600rpm fans are going to be replaced with a pair of san ace 9S1212H4011 fans soon so hopefully that should shave off enough to get load temps down to the high-70s if not low-80s.

ergh, spoke a lil' soon. seems a single test was failed on one worker (p95 blend). bah, this is a first, the whole systems normally reboots on me, time to do some research :(
 

nzaneb

Limp Gawd
Joined
Oct 19, 2009
Messages
341
QPI/Dram up to 1.35V, Vcore down to 1.35-1.375V, Drop PCIe back to 100 (no need to touch it unless you're pushing past 220 bclk), Turn CPU PLL down to around 1.7V (1.8, which is stock, is not needed)
Basically you need more VTT and less VCore. How much ram are you running?
 

Skull_Angel

[H]ard|Gawd
Joined
May 31, 2010
Messages
1,664
QPI/Dram up to 1.35V, Vcore down to 1.35-1.375V, Drop PCIe back to 100 (no need to touch it unless you're pushing past 220 bclk), Turn CPU PLL down to around 1.7V (1.8, which is stock, is not needed)
Basically you need more VTT and less VCore. How much ram are you running?

just running 6GB, stuff's rated for 1600MHz 7-8-7-24 2N @ 1.5v, but I've tested it stable at 1700MHZ 8-8-8-20 1N @ 1.5v (haven't fully tested any higher speeds/tighter timings, I'm pretty happy with what it's currently at).

I've read that undervolting the CPU PLL too much could be dangerous, but no specifics were mentioned, is there any truth to that? this is the only reason I've left it at stock so far.

thanks for the advice, I'll have to check out your suggestions and see where it gets me.
 

nzaneb

Limp Gawd
Joined
Oct 19, 2009
Messages
341
just running 6GB, stuff's rated for 1600MHz 7-8-7-24 2N @ 1.5v, but I've tested it stable at 1700MHZ 8-8-8-20 1N @ 1.5v (haven't fully tested any higher speeds/tighter timings, I'm pretty happy with what it's currently at).

I've read that undervolting the CPU PLL too much could be dangerous, but no specifics were mentioned, is there any truth to that? this is the only reason I've left it at stock so far.

thanks for the advice, I'll have to check out your suggestions and see where it gets me.

I've had i7 920, W3520, 980X, X5677 all up over 5ghz with CPU PLL at less than 1.7 (usually around 1.65) You can leave it stock, just know that it can go lower. On bloomfield/gulftown, there are usually specific ranges where VTT likes to be. Some like high vtt (1.65V+ from 4.5 - 5.2 ghz like my 920) some like low vtt (1.45V-1.5V from 4.4ghz - 5.7ghz like my 980X). Higher voltage does not always equal better with this platform. Once past the normal overclock (4ghz) you're looking for a specific voltage range that your chip likes to operate at.
 

Skull_Angel

[H]ard|Gawd
Joined
May 31, 2010
Messages
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hmm, most error messages I've gotten with my 4.2 OC have been memory related (124) like I stated above. I've been able to remedy this with my 4GHz OC with a vcore bump, but VTT didn't seem to have any effect (highest I took it was to 1.375v), does this happen a lot?

currently testing 4.2 again and suggested settings didn't pass a quick test with linx (124 error again). right now I've upped the vcore to 1.4v for another try (running a 3002B batch 950, most seem to be running B batches with higher vcore aside from a rare few). is it normal for chips running these speeds to get more temperamental about VTT like the higher 4.4+ clocks? 1.4+ VTT jus' makes my hair start to tingle on a D0, lol.

edit:taking vtt as high as 1.425v, the most stable setting still remained 1.3v. this sucker's gonna make me go cross-eyed.
 
Last edited:

olivete

n00b
Joined
Oct 25, 2010
Messages
2
Sup! My first post here :)
I have been running this i7 for like 1 year now and i decided to make it runs hotter :p

So yesterday i bought a new power supply replacing my OCZ 400W for a Corsair 650W, which i guess should be more than enough.
My current "build" is:
Corsair TX650W
i7 920 d0 ("lapped")
Intel DX58SO
OCZ 1600 Platinum 7-7-7
XFX 4850 ATI 512mb
1x 7200 HDD
1x SSD Intel
V8 Cooler ("lapped")
Artic Silver MX-2 paste

Just like the topic´s author i am trying to achieve a higher speed, so i will post my settings and ask you guys few questions, hope you can help me out :)

BCLK: 191
Vcore: 1.3625V
Ajustm: 12mv
Vdroop: Low (for performance)
Turbo: ON
C state: OFF
Hyperthreading: OFF
IOH: 1.250
RAM: 16/8 - 7-7-7 - 24 V: 1.66V
QPI: 1.325

1. I would like to get it running as 4.2 - 4.4, would be that possible once i am using air cooling?

2. Last time i was ~4.2ghz and Vcore was 1.3625V, is that too high? Looks kindda high, i dont want to make this cpu goes bye bye soon.

3. With 1.3625V to 1.4V to my VCore, would this i7 lives for 1-2 years? Is really 1.4V safe enough???

4. My temps with those settings are about 83-85 under prime95. Is that ok?

Thanks alot guys!!!
 

Skull_Angel

[H]ard|Gawd
Joined
May 31, 2010
Messages
1,664
Sup! My first post here :)
I have been running this i7 for like 1 year now and i decided to make it runs hotter :p

So yesterday i bought a new power supply replacing my OCZ 400W for a Corsair 650W, which i guess should be more than enough.
My current "build" is:
Corsair TX650W
i7 920 d0 ("lapped")
Intel DX58SO
OCZ 1600 Platinum 7-7-7
XFX 4850 ATI 512mb
1x 7200 HDD
1x SSD Intel
V8 Cooler ("lapped")
Artic Silver MX-2 paste

Just like the topic´s author i am trying to achieve a higher speed, so i will post my settings and ask you guys few questions, hope you can help me out :)

BCLK: 191
Vcore: 1.3625V
Ajustm: 12mv
Vdroop: Low (for performance)
Turbo: ON
C state: OFF
Hyperthreading: OFF
IOH: 1.250
RAM: 16/8 - 7-7-7 - 24 V: 1.66V
QPI: 1.325

1. I would like to get it running as 4.2 - 4.4, would be that possible once i am using air cooling?

2. Last time i was ~4.2ghz and Vcore was 1.3625V, is that too high? Looks kindda high, i dont want to make this cpu goes bye bye soon.

3. With 1.3625V to 1.4V to my VCore, would this i7 lives for 1-2 years? Is really 1.4V safe enough???

4. My temps with those settings are about 83-85 under prime95. Is that ok?

Thanks alot guys!!!

your temps are pretty high for 4.2 at your blck setting w/o hyperthreading, I'd suggest reseating your heatsink. these cpus can take vcore as high as 1.55v before degradation is pretty much guaranteed, though you're unlikely to get that high on air cooling with safe temps, even on water the temperatures would likely be unsafe. there's no real knowing the full impact of higher OCs on life-span, though keeping within safe voltages and temps it's likely they'll out last a longer upgrade cycle.

you may want to start your own thread and post a bios template with your specific setting and target clocks to get more specific help.
 

olivete

n00b
Joined
Oct 25, 2010
Messages
2
I will try, thanks for the quicky answer, and sorry for my post here. Hope the author dont get angry.
Let me try to get some screenshots and photos, so i can create a topic.
But, just for make sure, even with those settings, i should be able to keep it running with out burn it, right?
 

nzaneb

Limp Gawd
Joined
Oct 19, 2009
Messages
341
Have you ran Memtest on your Ram? Sounds like Ram issues. Can you link me to your Ram specifically?
 

Skull_Angel

[H]ard|Gawd
Joined
May 31, 2010
Messages
1,664
this should be it. I haven't found any real info on what ICs were used, the only info I've gotten is that g.skill seems to use mostly BBSE (would rather not pull off the heat spreaders to find out personally, lol).

edit: oops, yeah I ran memtest86+ for 15hrs at 1700MHz 8-8-8-20 1N @ 1.5v, cpu was overclocked to 212x14 at the time.
 
Last edited:

Rossi~

2[H]4U
Joined
Dec 8, 2008
Messages
3,479
QPI/Dram up to 1.35V, Vcore down to 1.35-1.375V, Drop PCIe back to 100 (no need to touch it unless you're pushing past 220 bclk), Turn CPU PLL down to around 1.7V (1.8, which is stock, is not needed)
Basically you need more VTT and less VCore. How much ram are you running?

I want to just jump in here and thank you. I have had my i7 920 C0 since December 2008 and never been able to find anything over 3.93GHz stable without a LOAD of voltage.. This is because i always set the PLL voltage to 1.9v or 1.92v as advised by many people/reviews. I did set it to auto a couple of times but to no avail.
I just saw this and googled lower PLL voltage for i7 and others tell the same story, lower the PLL voltage... So i set mine manually to 1.8v (default) and climbed back up to 3.95GHz IBT stable.... I then gave it a rest because IBT takes AGES to run with 9gb of RAM...
I will push further and i know i have more headroom now so thanks, all this time i was resting at 3.85 or 3.93 @ 1.32v (depending on the weather) and now i can kiss that goodbye and run onto the big 4 finally, which used to need 1.45v!!

Ross
 

RadXge

2[H]4U
Joined
Aug 2, 2006
Messages
2,849
My i7 950 has been perfectly stable so far at 4.0GHZ with VCORE at 1.2125. Temperatures are around 67-69C at load. I do not want to go beyond 70C so I leave it this way. Good luck with our overclocking!
 

Skull_Angel

[H]ard|Gawd
Joined
May 31, 2010
Messages
1,664
thanks

I've narrowed the problem down a bit. she passes 8 hrs p95 small fft and 6+ hrs memtest86+, so what I've found out is that either it's likely something to do with the QPI or p95 blend test is trying to test the page file. the second part seems more likely because the tests that fail are normally the larger sized ones.

I'll try installing some of ati's monitoring tools to keep an eye on the PLL, I've noticed some having problems with PLL LLC enabled, but if possible I'd like to have it enabled to keep the voltage down during idle. CPU LLC seems to be pretty solid on this board though, I've never seen it vary more than 0.04v, so I'd like to think PLL LLC was on the same level.

can anyone with PLL LLC disabled tell me how much it normally varies from idle to load? (I know this will differ from board to board)
 

Skull_Angel

[H]ard|Gawd
Joined
May 31, 2010
Messages
1,664
I'm not sure if this effected my OC results (and I doubt it), but I just realized my OS drive is going out (luckily I ordered a new one earlier this week so I don't have to fall back on my old/slow clone drive). so far there's no indication of it failing using diagnostic software, but the read head is making tons of noise on top of it needing nearly 20 min to boot up this morning under stock clocks.

tried windows boot sector repair earlier and no problems were found, as well running under other stable system clocks with no change in boot times or noise.
 
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