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E8400 Can't Get Above 4Ghz - Page 2

post #11 of 17
Thread Starter 
Hey can you also tell me when VTT, PLL, MCH comes into play? I have some idea what they are about but no idea when to adjust. Thanks
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post #12 of 17
Yeah. Cpu term need's to be up. You are more than safe to set both cpu volts and cpu term to both 1.35v and it should be stable @ 4ghz

I would try 466x9 with 1.375v on both cpu settings and shoot for 4.2ghz if your temps still are 75c or below on load.

IOH is your North Bridge. This sometimes helps to bump a up a little
ICH is your South Bridge. This you bump up a little if your running SLI
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post #13 of 17
Check your voltage while under load with something. CPU-Z worked for me with my E8600.

As long as your load volts don't go above 1.45 you are gravy.

You may also need to bump your NB volts up a bit.
 
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post #14 of 17
Thread Starter 
I'm currently on

FSB: 460
Vcore: 1.35
Vdram: 1.9
Vmch: 1.3
Vtt: 1.36

idle: 38c
load: 56C

Testing for stability right now. Just curious, what are the safe range for vmch, vtt ? Are any of these setups too high?

Edit: those are mobo settings, cpu-z says vcore is 1.28v on load after vdroop.
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post #15 of 17
Thread Starter 
Guys I've tweaked around with the voltage settings but still dont have full system stability at 4.0GHz. By that I mean, the computer would freeze at times when I play games. I've tried prime95 for a short amount of time and it seemed fine.

Current bios settings:
fsb:445
vcore:1.306
vdram: 1.84v
vmch: 1.31
VTT: 1.32

The rest are motherboard normal. :/ I really would like to get 4.0 stable for a while first before I move onto higher OC. Any helps appreciated.
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post #16 of 17
As stated before I wouldn't bother going over 1,36 unless your temps are superb. I mean you could try it for benchmarking without to too much damage. I wouldn't run it 24/7 though too high though.
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A very big SHO
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Western Digital 640 Samsung 830 SSD 2 Western Digital WD10EZEX Raid 0 Sony Optiarc 
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post #17 of 17
Thread Starter 
Okay so, right now I've tweaked the settings a bit more and have seemed to fixed the freezing issue. But sometimes the programs still crash randomly on use. Would upping the vcore help?
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CPUMotherboardGraphicsRAM
Core 2 Duo E8400 E0 Gigabyte EP45-UD3LR Gigabyte GTS 250 6GB Hynix 
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Main Rig
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CPUMotherboardGraphicsRAM
Core 2 Duo E8400 E0 Gigabyte EP45-UD3LR Gigabyte GTS 250 6GB Hynix 
Hard DrivePowerCaseMouse
1TB 7200rpm Cooler Master 550W Thermaltake V3 Black Microsoft Sidewinder X8 
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