Hi, I bought last days an old 600e for my parents.The model is a 4Ax one (PII 366 Mhz,64 Ram).I wanted to update the RAM memory, so I got 128 x 2 SODIMM PC100 (in total 256).I know that the mainboard support only PC 66 but I found on some forums that some guys could use this kind of SODIMM module with PC100. The problem is: my mainboard uses only 160 RAM (32 onboard and 128 RAM.) I wanted to use all RAM memory (288 RAM or least 266),but the mainboard uses only 160. The bios is last updated (http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=DSHY-46HLKQ). When I open the Config from Bios menu,the mainboard recognizes 288 RAM but it uses only 160. I know also that I can disable the 32 onboard memory if I open (with Ctrl+D) the CMOS editor and I change the byte values from 2B (from 80 to 81).In this case I got less memory: 128 RAM. How can I make a change in this editor (some bytes values changes) to use all RAM memory (288 or 256 RAM)? Please help me! Thanks in advance, Alex.