SDRAM (Synchronous Dynamic Ram) is designed to synchronize itself with the clock cycle timings between the memory and the computer bus to maximize performance and prevent system problems.
Axiom AX - DDR2 - 64 GB: 8 x 8 GB - FB-DIMM 240-pin - 667 MHz / PC2-5300 - fully buffered - ECC
64MB PC100 non-ECC SDRAM memory upgrade for Apple Power Mac G3 Yosemite, Power Mac G4 PC100, G4 Cube, iMac G3 350MHz+ and many PC-based desktop computers with a 100MHz or 66MHz memory bus speed.
EDGE - FPM RAM - 64 MB: 2 x 32 MB - SIMM 72-pin - 5 V - parity
EDGE - FPM RAM - 32 MB - SIMM 72-pin - 5 V - parity
64MB 3 3V EDO 144-PIN SO UNBUF 60NS
EDGE - Memory - 64 MB