Bad E8400, or Bad Mobo?

[OCGuy]

My E8400 needs 1.44V Idle in CPU-Z to pass Orthos @ 4ghz. The vdroop on this board drops it .1V on small FFTs, so I fail at anything lower. However, I am stable at 3.8ghz @ 1.3625v.

Question: Is it my crappy Mobo (P5KC) and the Vdroop that is killing my 4ghz, or could it just be the chip gets power hungry over 3.8ghz? I find that odd, seeing how I have helped many other people OC thier Wolfdales, and have seen 4ghz stable at as low as 1.27V.

 

[Zap]

You are hitting your OC limit. I've noticed that as CPUs reach their limit, they will suddenly need more and more voltage for minimal MHz gains.

Originally posted by: Ocguy31
I find that odd, seeing how I have helped many other people OC thier Wolfdales, and have seen 4ghz stable at as low as 1.27V.

Pure luck of the draw.

 

[RamIt]

My 8400 tops out at 3.8ghz with 1.328v idle in cpuz.
Cpu voltage drops to 1.272 under full load.
Asus p5e-vm hdmi

 

[footballrunner800]

Exacly what happened to me. I even returned it to frys for another one with the same luck. Both Had a stuck sensor (like 8c temp difference) and needed more than 1.4v to hit 4ghz.

 

[imported_Champ]

Thats alot of vdroop...if its going from 1.44v to 1.34v its probably not helping.

if you wanted to fix that you could try a pencil mod?...i did one on my P5K vanilla and my vdroop went from .07v to .01v from BIOS and no load vdroop...although alot of people will not recommend it...although it is the only reason i was able to hit 3.9 on my P5K (I was stuck at 3.6 for a long time until I did this)...but if the vdroop is that much you might be able to pull off something higher...or at least using less voltage

3.9GHZ at 1.3625v vdrooped to 1.355v...and I got a lucky chip that won't go any higher without stupid volts...same cooler too 40C idle and 60 load