I'm shopping for more memory for my PowerMac 9500 with G3 upgrade. Currently I have 144MB (64+64+8+8). What is the difference between a "5v FPM 64MB DIMM" and a "5v EDO 64MB DIMM?" I think I purchased EDO's last time. I have them interleaved, and want to continue doing so. Is it a compatibility issue or a performance issue between FPM and EDO?