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e8400 overclock- Can't get 4.0ghz stable

post #1 of 9
Thread Starter 
Hey guys,

I recently got a new motherboard for my e8400 (P5Q Deluxe) and decided to play with some overclocking. This is my first time overclocking so bear with me.

I've been trying to get to 4.0 Ghz, which is a pretty good overclock considering I have the C0 batch/revision? So I've been playing around with my voltages, but everytime one of my core is failing on prime95 a few minutes in. So I loosened my RAM timings to 7-7-7-21 and have the DRAM voltage at 2.12v. The CPU vcore is at 1.36 I believe, and is showing as 1.352 in CPU-Z. The NB is at 1.4v (is this too high?).

I don't want to up my vcore too much so I was wondering what should I do from here. I've seen people getting 4ghz with like 1.3v vcore on these forums. Am I doing something wrong?

Thanks for the help. Cheers!
Whitey
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Whitey
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post #2 of 9
Set :

FSB voltage = 1.30V
NB voltage = 1.30
CPU GTL = 0.63
PLL= 1.54V
RAM voltage = 2.1V

Also run RAM @ 888MHz and FSB @ 444 for 4GHz..

If you still get error then its probably your RAM..

Also test with 6x multiplier with P95 Large FFT for a couple of hours..

6x multi it to be sure that Vcore is not a problem..

Once you pass P95 with 6x multi then up it to 9x and up Vcore and test again w/P95 until you're stable..

Keep Vcore under 1.4V (LOAD) and core temperatures under 75C all the time..

CHEERS..
     
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post #3 of 9
C0 ... you will be lucky to stay at 4ghz stable... they have tighter cache latency than the E0's and as such, dont typically clock as far on air/water.
post #4 of 9
If you are new to over clocking don't take short cuts, put the time in to find the limits of FSB, RAM and CPU individually. Blindly loosening timings and upping voltages may work eventually but it's bad practice and perhaps unnecessarily stressing components.

Start by dropping cpu multiplier and memory divider so you know they are stable then see what you need to get the north bridge up to 450mhz or whatever you're shooting for, then play with memory on loose timings to get that to desired/stable settings and then finally start increasing the cpu. By doing things this way it is much easier to know which voltage/timing to adjust in order to regain stability.
post #5 of 9
Thread Starter 
Well I know what it took to get 435 FSB stable. When I found that it was stable I went on to push 440 and 445.

I was wondering what range should the NB voltages be? I know that the vcore shouldn't go above 1.4v, but what about the NB. I've seen people go as high as 1.56v I think.

Thanks for the help guys.
Whitey
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Whitey
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2008 Rig
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NZXT Hale82 750W CM 690 II Black&White Logitech G400 AudioTechnica ATH-M50 
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e8400 @ 4.0 Ghz ASUS P5Q Deluxe Asus EAH6950 1GB DCUII 2x2gb G.Skill 1066 
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post #6 of 9
Well with good cooling you can treat it like a 65nm cpu so yes around 1.5v is ok but for everyday usage you may want to stay below 1.4V and anywhere near that you should really have an added fan aimed at/affixed to the north bridge heat sink. But anyway you shouldn't need to go much above 1.3V I wouldn't have thought for a dual core and 2 dimms.
post #7 of 9
*NBv is dependent on amount of RAM and latency.. if you are pushing sub-50ns latency with 2x2GB kit.. you may need ~1.4v MCHv for example, to get the NB stable. Really just depends on your RAM, and your tuning ability + NB cooling.
post #8 of 9
You have a C0 so you can't worry about other people with lower VCore, they're all on E0 stepping.

You're good to 1.4, and that's what it will probably take with your chip.

You have 1066 RAM, why are you loosening your timings? Drop your CPU multiple like KingT said and run Prime Blend 6-8 hrs. Otherwise you're wasting alot of time trying to play with NB/RAM settings if it's just your CPU holding you back.
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SFF: HADRON
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post #9 of 9
Thread Starter 
Ok, so I finally have some time now to play around.
So should I try to get the minimum voltages needed to get the FSB to 445 with 6x multiplier? And when I have that stable raise the multiplier and just the vcore?
I could see that making my life a whole lot easier.

Thanks
Whitey
(12 items)
 
2008 Rig
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Intel i5 3570K Z77X-UD5H ASUS 6950 Series DCUII 1GB 2x4GB Corsair Vengeance 2133Mhz  
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Crucial M4 256GB | Samsung 1TB F3 Thermaltake Frio w/ AP-15's Push/Pull Achevia Shimian Lite 2560x1440 Saitek Eclipse II 
PowerCaseMouseAudio
NZXT Hale82 750W CM 690 II Black&White Logitech G400 AudioTechnica ATH-M50 
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e8400 @ 4.0 Ghz ASUS P5Q Deluxe Asus EAH6950 1GB DCUII 2x2gb G.Skill 1066 
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Whitey
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2008 Rig
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Hard DriveCoolingMonitorKeyboard
Crucial M4 256GB | Samsung 1TB F3 Thermaltake Frio w/ AP-15's Push/Pull Achevia Shimian Lite 2560x1440 Saitek Eclipse II 
PowerCaseMouseAudio
NZXT Hale82 750W CM 690 II Black&White Logitech G400 AudioTechnica ATH-M50 
CPUMotherboardGraphicsRAM
e8400 @ 4.0 Ghz ASUS P5Q Deluxe Asus EAH6950 1GB DCUII 2x2gb G.Skill 1066 
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1Tb Samsung Spinpoint, 500gb Matrox Thermaltake Toughpower 750W Antec 900 
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