I have c2q q9400, and trying to overclock it. I can set FSB to 510-520 MHz and bios loads and works fine, but i cant load windows, and this happens when FSB is above 480 MHz. When FSB below 480 windows loading. What it can be?

 

My cpecs are:

mobo P5K

mem corsair 6400c5c

 

I tried to set CPUV 1.5V, dimmV 2.2V and NB 1.45V

Some photo =)

Edited November 5, 20159 yr by psycho

1 setfsb in win

2 pll voltage helps

3 set 6x fist and find max fsb

 

and wtf, google it.

Pll should be as low as possible for 45nm from my exp. Vtt will definitely help at higher fsb. And GTL refs are crucial for quads.

as TR said, keep PLL low, 1.5v is min in your case I believe, increase NB volts but get a fan over it.

 

Also you need to get something better than an Intel stock cooler to overclock with so that's holding you back too.

I cant overcome 480 fsb, setting in setfsb, tried different voltages and ratios, btw clocked memory to the max http://hwbot.org/submission/3030960_

The P5K isn't the most capable board out there. Does it allow GTL tweaking? If so, check into this thread:

 

http://www.xtremesystems.org/forums/showthread.php?202292-How-to-set-up-GTL-Ref-Values-for-45nm-amp-65nm/

P5K was an amazing board for the price (at the time).

 

Used it with the Core 2 E6300 back in the day. 515FSB on air and 630FSB on LN2

But he's pushing a quad!

Yes ! 775 quad oc is about Gtl-s from near 500 fsb. From here You have to increase Vtt voltage usually. I don't know how much is the base voltage for it in that board. Without gtl setting (and skew-s even) I think 480 - 500 is the upper level but it depends how well can the board and the cpu can work together. P35's Pll should be enough for even much higher clocks I think. You can try raise Vtt higher than the cpu needs it. Maybe You can raise 5-10 fsb if the reference voltages moves the right way. It's not the nicest way, but someday it helps a bit.