Overclock wall

Doc Shorla · 13 Jan 2007 at 16:44

Asus P5b
E6600
Cellshock 2gb 6400

Hit some probs in my overclock. FSB at 355 works perfectly, but at 400 it does not manage to get into windows. Running mem at 1:1 ratio, at timmings of 4-4-4-12 2.15v (specified by manufacturer), loosened timmings to 5-5-5-15 and still no difference. Vcore set at 1.4v, vdimm, 2.15, sb and mch voltage currently set to auto. Any suggestions much appreciated. Thanks

Mr_T · 13 Jan 2007 at 18:21

I've got pretty much the same issue. I've settled for running at 360x9 = 3.24, would like to get to 400 though so I'm going to carry on playing with it tonight, i'll let you know

Dirk · 13 Jan 2007 at 18:48

If you're using the default x9 Multi on the cpu, i.e going for a 3.6Ghz clock speed you'll probably need between 1.5v-1.55v on the vcore. IF your mobo is capable of a 400fsb.

Try 1.5v on vcore and 1.7v on the mch. Raise the fsb from where you are now in 10Mhz increments and test with Superpi each time to monitor temps. If temps are ok you are safe to go upto 1.6v max on air cooling. If you can get to 400x9 Superpi stable and temps look ok try a good stress tester like Orthos. Watch the temps all the time.

OC_A64 · 13 Jan 2007 at 19:14

Try a bit more vCore as suggested - 1.5 should be enough to get you into windows.
Try booting at 402/403 FSB as well, see if that helps

Doc Shorla · 13 Jan 2007 at 20:12

I forgot to mention i was running x9 multi. Thanks guys ill give it a bit more volts and see what happens.

Mr_T · 13 Jan 2007 at 20:46

Hmmm, I've managed to get a stable clock at 9x400 = 3.6GHz

I get super PI caluating to 1 Million in 14 seconds, but when I run 3DMark 05 the cpu test end up at 0 - 1 fps where as before they were at 4 - 6 fps?!

VCore = 1.5
Mem = 2.25
FSB Termination Voltage = 1.45
Nbridge = 1.65
Sbridge = 1.7

Weird!

Van Diemen · 14 Jan 2007 at 08:29

Mr_T said:
Hmmm, I've managed to get a stable clock at 9x400 = 3.6GHz

I get super PI caluating to 1 Million in 14 seconds, but when I run 3DMark 05 the cpu test end up at 0 - 1 fps where as before they were at 4 - 6 fps?!

VCore = 1.5
Mem = 2.25
FSB Termination Voltage = 1.45
Nbridge = 1.65
Sbridge = 1.7

Weird!

A touch more vCore is what you need.

Mr_T · 14 Jan 2007 at 10:55

Van Diemen said:
A touch more vCore is what you need.

Yeah that did the trick! 1.55v and I've got it stable and working in everything!

3Dmark06 came out at 6837!

I think I will take it back down to 3.24 though as the idle temps are 56 degrees and load are around 65 degrees.

Doc Shorla · 14 Jan 2007 at 14:01

Turned out to be bit of fsb hole, hot past that then upped the vcore and thats sorted it perfectly. Thanks