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OCing a i7 970

J

jfb9301

[H]ard DCOTM x4
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Jan 11, 2005
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I had thought I had a reasonably good overclock. I'm running my 970 @ 23X181 for a final speed of 4153.

Yet 3 times in the last 2 days I read of others running their 970s at 4300+. Near as I figure you guys doing it are using 24X175ish.

These 970s seem to be finishing 6901s in 22 minutes or so, I'm right around 27 minutes.

I routinely BSOD when folding and pushing into the 180s on QPI....181 is stable, I've never tested 182, as 183 is a guaranteed BSOD.

I struggled to get this rig stable where it is, the key seemed to be lowering the CPU PLL to 1.65.

This Rig is stable Prime95 at ridiculous temps (90C+) and frequencies 4200+. It just refuses to fold that high.

Cooling details are here http://hardforum.com/showthread.php?t=1583655 (note there has been further modification to the H70, I replaced the stock 120x25mm fans with some panaflo 120x38mm fans)

settings are:

Main
Dummy OC dis
Extereme Cooling dis

CPU Clock Ratio 23
CPU Host Freq 181
MCH Strap auto
CPU Uncore Freq auto
CPU Clock Skew 0
Spread Spectrum dis
PCIE Freq 100
OC Recovery dis
Turbo Performance dis

Memory Feature
SPD stand
Control Setting en
Memory Freq 2:8
Channel Interleave 6 way
Bank Interleave 4 way
Low Gap auto
8
8
8
20
74

Voltage Control
Vdroop dis
CPU Vcore 1.3375
CPU VTT 0
CPU PLL Vcore 1.65
IOH PLL Vcore 1.8
QPI PLL Vcore 1.15
DIMM Voltage 1.6
DIMM Vref 0
IOH Vcore 1.5
IOH/ICH I/O Volt 1.5
ICH Vcore 1.2
VTT PWM Freq default
CPU PWM Freq default
CPU Impedance auto
QPI Impedance auto

CPU Feature
Speed Step dis
Turbo dis
CxE dis
EDB en
VT en
HT en
Active Cores all
QPI control en
QPI Link en
QPI Freq auto

I realize this is NOT an overclocking subforum, but in general I've found that we are a little more sensitive to the fact that folding is a little less stable than say prime95. I just feel that I need help from fellow folders and not people who feel that prime95 stable at 4.5 is good enough when I can't fold over 4.15.


 
I am at 21 x 207. Just because you have a 24x multiplier doesn't mean you need to use it. If I were you, I would follow one of the several I7 overclocking guide. Oversimplified, it is basically;

1. Set your multiplier and memory multiplier as low as possible and see how high you can get your bclk
2. Leave your multiplier as low as possible and see how high and what settings your memory can do
3. Start raising your multiplier to get to a final overclock

Don't jump ahead and go for a final clock speed. You have way too many variables going on to know exactly what is causing your issues. Isolate everything as much as possible. It ends up making everything easier in the long run.
 
H70 is just too weak, you can modify it as much as you like but the little pump can only pump so much hot water. 90 is rediculous anyways!
 
DeFex said:
H70 is just too weak, you can modify it as much as you like but the little pump can only pump so much hot water. 90 is rediculous anyways!
Click to expand...

Mine runs with a bone stock Cogage True Spirit. I wouldn't think that the H70 would be any worse than that, but maybe.
 
Yea, I know.

I fold at 75C or so....

This board and RAM just don't like high BCLKs, Highest I ever got was 186 on a 920. Highest BCLK using this 970 seems to be right around 181, so yesterday I tried 24X on a lower BCLK and 4.2 was still a BSOD. I'm betting figguring out which voltage to adjust could be the answer to a higher overclock.
 
Vtt and maybe IOH will affect BCLK limits. Vmem, Vtt, and IOH affect memory, Vcore, Vtt, and IOH affect the CPU clock. I have no idea what they are labeled on the EVGA board, but those are the only ones you really need to worry about.
 
You should set your ram manually to a lower multi and see if that allows you to raise bclk. If it still doesn't work, find an i7 overclocking guide, set vtt and ioh to near the recommended max and see if that helps. You can always work voltages back down if they seem high. Also test to make sure your CPU PLL isn't too low.
 
musky said:
Mine runs with a bone stock Cogage True Spirit. I wouldn't think that the H70 would be any worse than that, but maybe.
Click to expand...

I tried one on a 970 It got a lot hotter than with a megahelams, and i only have one fan vs 2 on the corsair (this is in a very small lian li pc 05 case, so maybe that makes a difference)
 
I don't think CPU PLL is too low. Any Higher and I get "CORE CLIENT COMMUNICATION ERRORs".
 
musky said:
I am at 21 x 207. Just because you have a 24x multiplier doesn't mean you need to use it.
Click to expand...

Counterargument: I had trouble getting a stable high BCLK on my 980X, so I'm currently running at 26 x 160 for 4.16GHz. I'm currently seeing a 21:45 TPF on a P6901.

According to my ASUS sensor app, my CPU PLL is 1.8V. My CPU is at 1.3V, and the rest look fairly stock. I can't remember what I actually set in BIOS. CPU temp is avg 70C with a TRUE.
 
While its not an i7, my i3 refuses to do high BCLK. 24x177 is about all it will do.
 
i have mine running at 4.5ghz (188x24).. TPF is 19'49"/frame

i79701949.jpg
 
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