pc100 sdram compatability

[frank5]

I am trying to substitute pc100 ram for p66 ram . I have a pc chips m748lmrt MB. It has sockets 1 and 370. Board is jumperless and has BIOS options for 66 and 100mhz fsb. I am running a 400 celeron, socket 370 and using 64mb pc100 ram. 66mhz fsb * clock mult,6 runs well. When I bump up fsb to 100,regardless of the clock multiplier, the system won't boot up and I have to clear the BIOS in order to get things running again. BIOS only gives two choices for fsb, 66 and 100. I also notice that changing the clock mult. in BIOS does not effect CPU speed. If I use 3.5,4,4.5,7.5, regardless, the CPU speed is always 400. I tried updating the BIOS, but, I still have the same problems. I have a feeling that the clock mult. of this CPU is frozen at 6 and when I use a fsb=100 the end result is 600mhz which totally freezes up the system.
Please help,Frank

[frank5]

Forgot to mention that BIOS is AMI BIOS ver1.2,Frank

[Dominus]

All Celerons are multiplier locked, meaning you cannot change the clock multiplier from the default, on the 400a case, 6.

So if you raise the FSB to 100, you'll be running the CPU at 600mhz, and I can tell you with near 100% certainty that your CPU is not hitting 600mhz without extreme cooling (read: liquid nitro).

Perhaps you should invest in a new motherboard, perhaps an Abit BM6? Or even a BP6 & another 400a /forum/smile.gif.