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There appears to be a question about whether dram cards are compatable between the different Thinkpad models in the 700-755 series. I had an 8 mg dram card designated for a 750C that worked fine in my 720. When I tried to use the card in my 755C it worked well at first, but then I had various minor problems. I called IBM and was told that dram cards are downward compatable. Meaning that a 755 card would work on 750 and lower model numbers. There may not be complete upward compatabilty as the specs modified slightly for the newer models. Meaning that a 720 card might not work on a 755. I was warned that this applies only to IBM products. Apparently, third party manufactured dram cards may or may not be compatable. My card was a third party product. The 750 card continues to work well in my 720. The new 755 dram card works well in my 755. Be warned I'm just a dumb lawyer with no real tech knowledge so the forgoing is only anecdotal info at best. David M. Grey