Hitting an OC wall. Q6600 + MSI P6N SLI Platinum. Please help.

Foocoustic

Guest
Nov 7, 2008
13
0
18,510
I have a Q6600 B3 stepping and just put on a new Zalman CNPS10X wich dropped its operating temps 20c, I currently have it overclocked from 2.4Ghz to 3Ghz and load temps (Prime95) barely go over 50c so I have plenty or room to keep going. I want to hit 3.4-3.6 Ghz.

Currently I have my MSI P6N Sli Platinum (nvidia 650i chipset, updated to lastest bios) overclocked to FSB 1333 wich puts the CPU at 3Ghz and its stable after 3 hours of Prime 95. . I Can't go any further with out either no picture output whatsoever or windows crashing at the loading screen.

Since my temps have been fine, I increased memory, north bridge, and CPU voltages close to their maximum (but safe) values just to eliminate that as the cause of instability, but still no success. After returning to my 1333/3Ghz clock I lowered them back down.

I have 4 Gb of Corsair XMS2 DDR2 800 memory, should be 4-4-4-12 timings but I left that set to automatic in the bios and its running at 5-5-5-15. CPUZ indicates a ratio of 11:13 so its currently running at 394mhz (basically 800mhz as I understand).

There are a few settings in my bios worth mentioning:

photo2.jpg
photo1.jpg
photo.jpg
 

Foocoustic

Guest
Nov 7, 2008
13
0
18,510
Ive been doing a lot of tinkering since my initial post and have found some strange results. For one there are holes in setting the FSB and being able to boot. If I go above 1333 it doesn't even boot, often I have to clear cmos. If I go to 1500 and high voltages I can get it to boot but doesn't run stable.

At this point I'm not sure if its my memory, CPU, or FSB giving me the problem. It seems to be a compination, but I'm leaning more towards the memory and FSB that are the culprit.

One very odd thing is that the CPU multiplier seems to be stuck at 9. No matter what I have it set to it, its still always 9x in CPUZ and BIOS hardware monitor.

Also, there seems to be no setting to control memory multipliers. If I leave it in linked mode it seems to run at random ratios depending on where the FSB is set to, where as manual can keep it at 800mhz.

MSI P6N SLI Platinum
Intel Q6600 B3
Corsair XMS2 DDR2 800 4-4-4-12 4Gb
 
Yes the multi was stuck only black edition CPUs can change multi. Back on the core 2 CPUs you had to increase FSB to get your overclock thats just how it worked. The memmory multi will try to keep you memmory running within the speed ram you have and does this automaticly on some boards and can be done by hand on others.