The "Official" 8400 OC thread

Ah, OK. I'm using Speedfan (registered for the new beta). Speedfan's "CPU" reading is, I believe, 15ºC too cool. (Saw some discussion about this on another forum) However, the 2 "Core" readings are more like it. For example, Speedfan reads my CPU (right now) @ 25ºC however, the two Core temps are both reading 41º and 42ºC. Real Temp sees the cores at 36ºC each. Core Temp see them both at 46ºC. eheh. :p
 
I have had my 8400 up tp 3.50GHz (389x9)

Vcore idle is 1.27V and at 100% load 1.25V

At stock 3.00GHz the idle Vcore is 1.13V and at 100% load it is 1.18V

Asus P5E3 Deluxe Motherboard
 
3.82~ghz, 425fsb, 1.34~v, Asus P5N-E SLI, Zalman 9500 on high
 
[email protected] (9x423) with a xigmatek heatsink/fan
1.2975 volts in Bios, 1.28 volts idle and 1.25 volts under orthos stress testing.
32 degrees idle, 53 degress under orthos stress testing (6hrs) measured with realtemp
gigabyte x38-ds5 motherboard.
0.05 extra volts to the northbridge to keep things running sweet.

screenshot.jpg
 
3.85GHz (8 x 482)
Bios Vcore: 1.35625
M/B Vcore: 1.344 (load and idle)
GA-P35-DS3P Rev 2.1
PCMark05: 9677
SuperPi (1M): 12.078

I get better performance with the 8 x multiplier and higher FSB compared to the 9 x multiplier and lower FSB I originally had (same CPU GHz speed).
 
aznpxdd said:
Did you increase the voltage to your ram too?
Click to expand...

If you are asking me, then no i didn't the ram is pc8500 and if running at full speed 1066 mhz then it needs 2.1 volts but as it is running at 846 mhz i found i could drop the volts to 1.8 and still have a stable system, which helps keep the heat down.
 
100% Stable
I'm at 3982.5Mhz
442.5 Bus Speed
1770 Rated FSB
Vcore is 1.424 at idle and 1.406 at load.
Vchipset is 1.5v in bios, 1.41 according to Speedfan
FSB VTT Voltage at 12%

MSI P6N Diamond 680i SLI motherboard ($120 after MIR)
Crucial Ballistix 2x1gig @ ~800mhz with slightly lax timings(did this for stability through testing, may change back since there is no stress on ram)

I'm getting about 36 deg C on load for the CPU with my old TDX waterblock that was just converted to fit 775 socket. I've got 2 chevette heater cores and a maze3 CPU heatsink on my 8800GS which is overclocked too.

The chipset had the fan removed because it was too damn loud. I stuck an old 70mm fan from stock Athlon XP heatsinks and put that over the chipeset. It hits 42 deg C on load.

I've got my AC running at 74 deg C economic setting.
 
I'm currently tweaking my e8400 as I havent been able to find the right speed/vcore ratio that im confortable with since my chip went through its "burn in" period. But I personally found that I am able to reach most OCs with less vcore when using the 8.5 multiplier as opposed to sticking with x9.

Heres a 9+ hour screen of my current settings:

40ghz_1328_9hrs_smalledited.jpg
 
That's a good overclock. I'm running with the same voltage at 9x450 and it seems stable for me. I was able to hit 4GHz at only 1.28v when I first got this thing but it looks like it "burned in" and needs the 1.32v. Still very happy with it so far.
 
My E8400 takes 0.0250 more volts after about 3 months of usage to reach the same Mhz..
It takes a little over 1.4125v to do 4050mhz (450*9) and that's just too hot.. it runs max temp about 31C to TJMAX which to me is too high.. should be closer to 40C distance to tjmax..
Room is kind of hot about 80F
Has anyone else experienced needing a little more voltage to get the same OC speed out of it? For instance for 3.8 ghz, I need 1.3125 where before I only needed 1.2875 , and at 3.6ghz it only needed 1.15v lol.. so weird how it needs so much more voltage to get so little mhz higher, but it works.. If I could only keep it cooler.. I have a TUNIQ T-120 it's HUGE but the cpu still gets hot.. the cpu cooler doesn't get hot though..
Maybe I'll try lapping ..
 
I have had mine to 4.3Ghz but that is just too much on air. 60C with a TRUE on a DFI X38 board.
It runs 52C at 4.1Ghz in the winter, now its down to 4Ghz and holding at 52C. Its hot as heck here.

cpu 1.28V
NB 1.34V
memory 2.03V

solid and stable in games
 
3.6GHz 24/7 at 1.275 V

Haven't really pushed it higher, I like this whole ram 1:1 thing @ DDR2-800, what an easy overclock
 
This is going to sound like overkill but...

3.6GHz (400x9)
VCore: 1.20v
GA-EP35-DS3R
Cooled with TRUE and Delta Hi-Speed 120x38MM fan

Yes, I know I could push it further, but I just don't want to go past 1.3v.
 
zrabbit said:
My E8400 takes 0.0250 more volts after about 3 months of usage to reach the same Mhz..
It takes a little over 1.4125v to do 4050mhz (450*9) and that's just too hot.. it runs max temp about 31C to TJMAX which to me is too high.. should be closer to 40C distance to tjmax..
Room is kind of hot about 80F
Has anyone else experienced needing a little more voltage to get the same OC speed out of it? For instance for 3.8 ghz, I need 1.3125 where before I only needed 1.2875 , and at 3.6ghz it only needed 1.15v lol.. so weird how it needs so much more voltage to get so little mhz higher, but it works.. If I could only keep it cooler.. I have a TUNIQ T-120 it's HUGE but the cpu still gets hot.. the cpu cooler doesn't get hot though..
Maybe I'll try lapping ..
Click to expand...

I'd just recommend trying differnet settings using lower multipliers. My Q748A chip is now 2 months old and after a couple days of tweaking I an running a lower vcore than when I first popped her in (1.344 vocre using x9 multi). I also found that setting my GTL values to auto worked best too.
 
I just started pacing my 8400 on air (TT Extreme120). Right now I'm at 3.9 with 434FSB with 1.3Vcore and 1.2NB. Prime, Orthos, Occt, memtest stable. However, I've crashed out of Crysis twice so now I'm rechecking. My 8800GT is voltmodded so that's the next check in case it degraded. After all the voltage *fear* I'm not going to go over 1.3 but that's because I'm a sissy.
 
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