Intel 975XBX + E6300 OC help

[Kyanzes]

I own a 975XBX and an E6300. I tried to OC the CPU and it works flawlessly at 2.8GHz (7*400) at stock vcore. Instant 1GHz OC. The problem is, however, that I can't try it higher. First I thougt I would do the fascinatingly hard OC mod and it would solve all my problems. Well, I did it, and it solved nothing. I'm still limited to 50% OC. Then I thought I would move from 1066 FSB to 1333 FSB so the basic FSB would be a lot higher to begin with 266-->333 (as this option appeared after the OC mod) Tried that, but even though I set the FSB to 1333, nothing happens. As if I have never changed it. It effectively remains at 1066. Even though when I go back to the bios, it's still set to 1333 as I left it.

Bios is v1334.

Any suggestions guys?

 

[Talcite]

The clockgen is limiting your OC. Most people use setFSB to get it higher than 50%. Look in the xtremesystems forums for more details.

 

[Wall7486]

Did you trying upping the voltage? What kind of RAMs do you have? Loosen the timings a little?

 

[Kyanzes]

The memory / voltage aren't the problem here. Thing is (figured it meanwhile) that for some reason after a failed POST (using any FSB for the failed OC) the 975XBX will never ever let you use any FSB other than 1066 until you actually clear the CMOS. Not even a LOAD DEFAULT helps here. After the reset you are free again to choose any FSB you like. Quite weird, obviously some safety feature they thought would revolutionize the market *arghh* After you have failed, from the next POST the FSB is locked at 1066. Can't go lower or higher. Appreciate the answers though.

Edit: you actually CAN change the FSB but it has no effect. It is displayed as if it would be set but effectively it remains at 1066.

 

[Kyanzes]

Correction: everyting I said stands, save for the need for CMOS reset. You simply HAVE to unplug the board (switch the PSU off). Thing is that I usually reset the CMOS the PSU turned off so that's why I thought the reset was needed. Figured it the way that I, again, ran into the problem, but before resetting the CMOS I had to do something else on a different board and moved the PSU to that one. When I plugged the 975XBX back, I forgot to reset it but it actually posted and kept the 1333 FSB setting, so I figured the reset isn't really necessary. But you still have to unpower the board completely for the safety feature to turn off. Tried it a few times and it always works this way, so it seems to be the final conclusion.

 

[Talcite]

So what does that mean? You can go over 50% burn-in?