In today's Macintouch, I ask "Do the DIMMs *have* to be matched by size? That is, could I remove one of the 256M DIMMs and put in a 1G DIMM (of appropriate speed) and have a 1.25G system?". David Charlap quotes from the owner's manual that it should be possible, but with some performance degradation, and says "As for how much it will suffer, someone will have to perform some benchmarks. Some computers don't take much of a hit, and others end up virtually crippled."
So, dear readers, if any of you have bought a 512M MacBook (not MacBook Pro), and have also bought a non-Apple upgrade to 2G, could you do some basic benchmarking in the three possible configurations (512M, 1.25G, 2G)? I would be happy to post the results here. CINEBENCH and the memory tests from Geekbench would be great.
Related but different question: how does amount of RAM affect battery life? More chips mean more battery drain, but more RAM means less use of the disk because of virtual memory. Any pointers to articles or notes on this would also be appreciated. The question for me is 1G vs. 2G; the cost of starting at 2G is fairly high, and is sure to drop over the course of a year, and if the DIMM pairing question above yields "forget it, you really want paired", going from 1G to 2G means throwing away the 1G DIMMs.