K7T Turbo switch to 266FSB problem

[cheche]

Superhornet,
Close all the bridges on L7 to get 1.85 volts at
boot up, and you can set a lower voltage in bios
that will take over.

 

[superhornet]

I've got 1200 stable with no FSB increase - just multiplier with 1.75 volts so I know voltage isn't the problem. My problem is getting to a FSB higher than 105! This is very frustrating.

 

[Losty]

well...umm...run sandra to see if you ram is running 133 ... if it is and you are trying 133fsb that means the ram is running 166 which prolly is the reason it's not booting....

 

[superhornet]

Yes that is the problem, when I go above a 100 FSB the memory bus speed starts climbing to. I can make it to 105 where the memory is at 139 but that's as far as it will go. How can I stop it from doing this? I turned off P2C/C2P Concurrency but that didn't help. Any suggestions.

 

[DaddyG]

You MUST make sure that your system POSTS and BOOTS OK at with the lowered multiplier and 100 FSB before changing anything. Make sure all BIOS options are defaulted, except multiplier. (Some BIOS options are NOGO between 100 and 133 and will cause problems). Connecting all L7s gives the CPU a kick right from the get go, no need to wait for the CPU to read and store the Vcore over-rides. You MUST test your memory at HSTCLK+PCICLK (or whatever your specific mobo calls this option) before you switch to 133FSB. Back off your memory timings to very conservative settings at this time, you can tweak em later. After the successful POST and BOOT at HSTCLK+PCICLK, restet to HSTCLK and flip the 133 jumper. If you are still NOGO, then its time for some L6 action. I've posted lots of info on this in the passed.

One slightly OT point, if I remember correctly, VIA is a FABLESS company, everything is fabeed out of VIA's facilities, its possible that different fabs are producing the KT133A chipset and some just dance a little faster !!.