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Help keeping my E8400 at 4GHz Stable. - Page 2

post #11 of 19
Thread Starter 
@Kunkka I tried running my rams at their default 1333/Unlinked & Synced still I get blue screen at 4ghz.

@slngsht I have the tuniq tower 120 extreme which is similar if not the same cooler. Could that be my problem? My temps aren't very high idle is in low 34C and on load gets up to around 58C. Ill try booting at 1.375v.
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post #12 of 19
C0 is a ***** as we all know; it might perform great, but from time to time, it will drive you crazy. As seen here and at many other places, it might take very high vcore to get it running. Since your temperatures are all right - and we will assume you are monitoring them properly and at full load! - I'd suggest raising vcore until you get it stable, just to see if you can make it work at all. What makes me wonder is that you said raising vcore above 1.42 makes it unable to boot? That's strange.

And I hope you keep your RAM underclocked while you are trying to overclock CPU - just for the sake of knowing it does not have anything to do with memory. Later on, when you are done with CPU, you can start overclocking RAM.
Ragtime.
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Ragtime.
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post #13 of 19
Thread Starter 
Sinner Thank for your input. You're right about it driving me crazy! I mainly test my stability with cpu intensive games like BF: BadCompany. Once I can successfully hit 4ghz without it crashing on me in a few minutes; ill move onto something like prime95.

That is correct if i bump my core voltage any higher than what it is on the screenshot it wont even boot and if i lower it it also wont boot.(i tried 1.375) which is one lower than my current volt. still doesn't stay stable.

When you say run my RAM under-clocked do you mean at their stock speeds and timings(1333) or lower than 1333?
Edited by HealorbeKilled - 3/22/11 at 7:46pm
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WD 750GB Windows 7 x64 SP1 SAMSUNG p2770 27' Antec 750W 
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My System
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WD 750GB Windows 7 x64 SP1 SAMSUNG p2770 27' Antec 750W 
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post #14 of 19
1333 is the fsb of the e8400. Your ram will generally be 800 or 1066mhz. While you are increasing your fsb, the ram speed will increase as well. You have to set the memory divider to keep your ram running at a speed it can handle.

in cpu-z, in the memory tab, it will display the speed of your ram. The number there will be half of your ram's speed. Multiply that number by two and that will be what your ram is running at.
Edited by slngsht - 3/22/11 at 7:54pm
post #15 of 19
Thread Starter 
These are the sticks i own. I dont think their either 800 or 1066mhz.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820231189
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E8400 @ 3.95Ghz - v1.43 XFX MBN790IUL9 GIGABYTE SOC 560 Ti G.skill 4GB DDR3 1333 F3-10666CL8D 
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WD 750GB Windows 7 x64 SP1 SAMSUNG p2770 27' Antec 750W 
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WD 750GB Windows 7 x64 SP1 SAMSUNG p2770 27' Antec 750W 
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post #16 of 19
search ebay for e8500 e0 and you will find my 5ghz duel for sale heh.
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Shermbox
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post #17 of 19
Thread Starter 
Quote:
Originally Posted by donrapello;12828904 
Wow.. 1.432v is pretty high even for a C0-stepping i guess biggrin.gif

My E8500 C0 needs 1.38v for a prime/IBT - stable oc.
What multiplier you're using? Bios settings screen would help alot..

I'm using 9x multiplier.. i cant boot 4ghz it at anything thats not 1.432 headscratch.gif
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8400 @ 3.95Ghz - v1.43 XFX MBN790IUL9 GIGABYTE SOC 560 Ti G.skill 4GB DDR3 1333 F3-10666CL8D 
Hard DriveOSMonitorPower
WD 750GB Windows 7 x64 SP1 SAMSUNG p2770 27' Antec 750W 
Case
CM 690 II Advanced 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8400 @ 3.95Ghz - v1.43 XFX MBN790IUL9 GIGABYTE SOC 560 Ti G.skill 4GB DDR3 1333 F3-10666CL8D 
Hard DriveOSMonitorPower
WD 750GB Windows 7 x64 SP1 SAMSUNG p2770 27' Antec 750W 
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CM 690 II Advanced 
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post #18 of 19
Thread Starter 
Quote:
Originally Posted by shermhead;12833516 
search ebay for e8500 e0 and you will find my 5ghz duel for sale heh.

Your not helping kungfu.gif
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8400 @ 3.95Ghz - v1.43 XFX MBN790IUL9 GIGABYTE SOC 560 Ti G.skill 4GB DDR3 1333 F3-10666CL8D 
Hard DriveOSMonitorPower
WD 750GB Windows 7 x64 SP1 SAMSUNG p2770 27' Antec 750W 
Case
CM 690 II Advanced 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
E8400 @ 3.95Ghz - v1.43 XFX MBN790IUL9 GIGABYTE SOC 560 Ti G.skill 4GB DDR3 1333 F3-10666CL8D 
Hard DriveOSMonitorPower
WD 750GB Windows 7 x64 SP1 SAMSUNG p2770 27' Antec 750W 
Case
CM 690 II Advanced 
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post #19 of 19
My C0 stepping Core 2 Duo E8400 did 4.05GHz (9x450) on no more than 1.384V, and it got up to 4.32GHz before giving out.

432GHz.png

I can't recall if it was 100% stable at those voltages, but I'd wager 4.0GHz should be on most any Core 2 Duo E8400 if I even got 4.32GHz on the same voltage. It would have likely gone even higher too (providing more voltage, that is). It wasn't even the CPU that gave out. I tried more voltage just to see. It's my RAM. It hits a wall at the same frequency (just over ~480MHz actual, ~960MHz effective) with three different CPUs. That was on air, by the way, with an Arctic Cooling Freezer 7 Pro.

Meanwhile, my current E0 stepping Core 2 Duo E8600 does 4.0GHz even (10x400) at 1.248V (actual, idle).

So, I say keep trying. Don't give up just because it's a C0 stepping, but you may just have a bad one. I'd play with the straps if you can. I found a looser 400MHz strap to be better, but you can give the Northbridge a bit more voltage if you can't do that.
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