Hi I have 2*32mb of PC66 SDRAM on my Abit LX6 PII 233 mobo. I recently installed one stick of 64mb PC133 with the 64 megs ofPC66. However, my once stable PC running WinXP beautifully now crashes when doing general stuff such as using Media Player or msn messenger - totally freezes - cannot press ctrl+alt+del or anything. it does not crash all the time but just random crashes. can anybody help. does anybody know why. I never updated my bios on this mobo, never had to. i never found an update to be honest. Can some one advise me.. Many thanks...

Your new Ram is not compatible with your pc. I understand that you can only add pc100 or pc133 ram to systems faster than 300mhz, if you have a 266mhz system, you have to get pc66 ram in order for you to update ur comp. Good Luck

Don't know for sure if this is true, but the 'wizards' at several places have told me that PC100/133 and PC66 memory are addressed differently. I tend to agree as I've never gotten PC100 to work on a 66 FSB...usually won't even boot. Bottom line is take the 133 out and put 66 in.

I don't know about that Sparks. Guess it depends on the hardware... I've run PC100 and PC133 memory on systems that have a 66 Mhz bus, I've also mixed PC66 with both of the higher speeds. I've never had any problems with it on my systems. I wonder if what Just Me said is true? That might be an explination. I've never tried to run the faster memory on a system that slow. So far I've only run it and mixed it on systems faster than 400 Mhz. AMD k6-2's, Celerons, and P3's. And I've never had any problems with it, no stability problems, no nothing.

Believe me guys, I fooled around with comps that are lower than 300mhz and tried to install pc100 or pc133 ram, I haven't had any luck yet.... I bet you if he changes his RAM to pc66 his problem would be solved :) l8r

I don't know if "Just me" has read my problem (Problems with upgrading SDRAM on ABIT LX6), there i have recently mounted 1X128 PC133 together with 2X32 PC66. The 1X128 works find but the 2X32 is "not there". Example: 2X32=64, 1X128=128, 2X32+1X128=128!! And it does not matter in what bankkombination i mount them.

I've got the exact memory layout on my old Pii266 - 2 32MB sticks of 66Mhz RAM and 1 128MB stick 133 Mhz RAM and have not experienced any memory problems. But the mobo is an Asus p2l97 and most Asus boards are really good with mixing memory. I've got an old TXP4 board that is running 32 MB of EDO and 32MB FPM with no problems either. Try popping out the 66Mhz RAM and running just the 128meg stick. Or you could try limiting the RAM Windows uses (don't know how to do that in XP but in Win9x you run msconfig - General - Advanced tab - Limit Memory) Jimbo