Can PC100 and PC133 coexist peacefully?

[Gravija]

i have an old P3 500 @ 560, an ASUS P2B-S Mb, and can i have my PC100 ram and my PC133 ram run peacefully together?
is there some special setting in the BIOS that i have to have? (i think i set mine under (from descending order) 2t 2t 2t 8t

and is there anyway to get the FSB up higher than 112? or unlock the multiplier (tried the jumpers on the MB, doesn't work)?
thanks

 

[samyboy]

I have P2-B that has P133 and PC100 on the same mobo. Never OCed them but they work fine.

 

[Killrose]

From my experience you have to use "manual" settings in bios rather than by "Spd" to get pc100 and pc133 to coexsist. Otherwise the speed eprom built onto the ram that tells the motherboard bios what speed to run it at could confuse and cause a lock-up.

I have had to use one stick to boot into bios and set things up, then add the other stick. And good pc100 should do 112MHz easy.

 

[Peter]

If the BIOS is in its right mind, it'll run the stuff at the slowest combined timing of either. E.g. if you have a CL2 PC100 and a CL3 PC133, then you'll get CL3 PC100 mode.

The SDRAM technology in itself didn't change, so when your system gets the timings right (either auto or by picking useful choices manually), they'll coexist.

regards, Peter

 

[Junkman]

I have a p2b-f with a 500 mhz PIII with pc100 and pc133 128mb sticks that worked fine at 115 mhz fsb. If you happen to have a powered usb hub attached to your system it may not boot at 115 mhz fsb. I just unplugged it before booting untill windows started then plugged it back in with no problems. I was not able to oc the 500mhz PIII any faster than 575mhz. I did upgrade my system with a super slocket and a 850mhz PIII, also replaced my pc100 sdram and added 2 crucial 256mb pc133 sticks and am now running my fsb at 120 mzh which oc'd the 850 to 1ghz. But I still have to unplug the usb hub in order to boot. Now that explains my Username....Junkman . As for the bios settings... I've used both manual and spd settings and both have worked ok. The spd (automatic) settings for the ram seemed to be conservative so I just experimented with more agressive timings until things worked.