I'm trying to figure out whether or not (and if not, why not) a 1G SODIMM would work in a 12" PowerBook (bringing the total memory to 1.156G. I recall that when the 12" came out, the largest PC2100 DDR SODIMM made was 512MB. Now IBM makes a 1G part: http://www-3.ibm.com/pc/support/site.wss/MIGR-46508.html?doctype= This KB article from Apple: http://docs.info.apple.com/article.html?artnum=14870 indicates that the maximum memory is 640 (the 128M built in with a 512M SODIMM), but is this a limitation of the memory controller? Or just a practical limitation of what was on the market when that was written? Anyone want to try this out for me?