Is someone able to OC FSB higher than 300MHz on Kentsfield

[francois methot]

Hi,
I will like to know if someone is able to OC the FSB higher than 300 MHz stable on Intel D975XBX2 mobo?

I did 395 MHz with TwinX Corsair 667 MHz but with OCZ (non-matched) PC6400 800 MHz I am not able to go higher than 300 MHz stable...at 8 X.

Do I need well match memory to push higher?

My goal was to have FSB at 400 MHz at 8 X!

Pushing the FSB give me more memory BW and MIPS for my CAD application...and I like that!

Any suggestions?

[pscout]

I don't have a badaxe but i have several quads running over 300 fsb.

x3210's and q6600's .. they range from 325 - 375 fsb ... the 2 at the high end are running on water.

All are 724 folding stable (eg near 100% load).

Q6600's on p5w64's the x3210's on ds3 rev 3.3

x3210s are 8 multi, q6600 are 9.

I haven't tried them without matched memory.

p5w64's are using 2x512mb crucial 6400 ... dont recall but i may have a mulitplier > 1:1 on these.
ds3 are running corsair 2x512mb 5400 ul 1:1

[francois methot]

...this is what I think (with PC6400 memory), the key must be with well match memory!

[Babrbarossa]

Does that board allow you to 'unlock' the memory?

Bad Axe 2 should have no problem going over 300MHz FSB on a quad. What kind of cooling are you using on it? What kind of instability are you encountering?

I haven't used a bad axe 2 in a while, but iirc it was a pretty good Kenty board.

[francois methot]

To answer Babrbarossa, I attached a picture of the option that I have with this board.

I have the Ultra Chill Tec electric cooler. I do not have problem with temperature...I monitor carefully with MemTemp.

When I cross the 300 MHz FSB...I can't post or if I post, Windows freeze or I started having error with Prime95.

With my TwinX Corsair at 667, I was able to go up to 395 MHz. But was stable and temp was at 65C (100% load) when FSB = 333 MHz and multiplier at 10.

[francois methot]

I attached the CPU setting

[Babrbarossa]

Try cranking the CPU up to 1.55V - should be no problem with the TEC- won't even make it sweat.

[francois methot]

I never try to crank the CPU voltage higher than 1.40.
I did try CPU voltage up to 1.55 volt and I was able to OC 9 X 333 MHz or 11 x 300 MHz with the non-matched OCZ PC6400 memory.

I compared the results of Sandra's Memory BW, CPU MIPS and MFLOPS and Super PI with the Corsair matched PC5400.

I concluded that a non-matched PC6400 800 MHz equal a good matched PC5400 667 MHz...Stable with Prime95 with Temp below 70 C. Too bad, I should know that to OC I should buy matched memory!

Now I have a problem: I did all my testing with only 2 sticks of 1 GB memory. When I tried to put back my two other Corsair sticks, the computer can't post anymore. I tried to reset everything at stock and still can't post.
I swap memory stick and same problem!!!
Is anyone encounter this problem before?

[sswilson]

Did you try a c-mos reset? It sounds like one or more of your "enhanced" memory settings is beyond the abilities of your second set of memory.