E6400 OC hit a wall ??? Must be missing something ?

[este]

Hi there

I just put this together and am stumped as to how I can get 3.2 (8x400) @ 1.375V no problem, but it just barely goes to 3.3 (8x412) @ 1.500V

E6400 (week 27)
P5B-Deluxe
Scythe Infinity with arctic ceramique
2GB G.Skill 6400 HZ
600W Xclio Greatpower
X1900XT CF Edition

I think The ram is good since I got it to boot into windows at 500Mhz, I can adjust the timings all I want, it doesn't effect the failed 3.2+ region. I think its a CPU/Mobo problem.

So I'm pretty much stumped. I wanted to run 3.4Ghz and by looking around at other OCs it looks like with these parts it should be cake. But no luck. I don't get it since the strap for the fsb should get looser over 400. It makes no sense.

I've checked CPUz, other then reading 1.150V all the numbers are dead on.

-Locked Pci to 33 and PCIe to 101
-The power supply is stable.
-Bios is updated to 804
-Followed bios guide at XS
-Can't seem to get +12Mhz without going up more then .125V !

Can anyone help ?

 

[este]

Hmmm.... After further investigation I think my temps are too high. I just got coretemp and TAT and something has got to be wrong.

1.4375V @ 7x472 (3.3Ghz) - Idle is ~50c Loads upto ~69c

1.3875V @ 8x400 (3.2Ghz) - Idle is 48c Loads upto 65c

After doing some reading that looks pretty high. I'm going to try and unseat the Scythe and take a look.

One thing though, it seems that the -second- orthos is stopped the temps fall almost to idle. No slope at all, just an instant drop. Is this correct or maybe an indication of a heatsink problem ?

 

[chrisewaters]

i have the same problem with my cpu i can hit 2.4 from to easy with 1.4v (240 * 10) but with 1.5v i can only get (255*10) temps are fine load at 40

 

[este]

Yea, kinda sucks.

It doesn't seem to be a FSB limit b/c I can run 400x8 or 457x7 and its fine. So far I've gotten that voltage down to 1.3500 (bios, 1.2960 actual), which is what orthos is testing at right now.

But for me to get to 3400 I need to go WAY higher. I don't really get it. I'm going to make a graph and see what works best.

Right now, I think I may settle on ~458x7 and get the ram timings down as low as possible. I wanted to be at 3.4 at least but after thinking about it, I probably don't want to deal with those temps anyway, thats the problem with web-clocking and OC Database charts, they tell jackshit of the real story.