Max. RAM and Front side bus speeds

Mac model	Max. RAM	Front side bus speed	Notes/Details
Power Mac G3 Beige	768 MB	66 MHz or 83 MHz*	*Jumper setting in 6 MHz steps. 10 to 15% performance gain. Steps in between not recommended. PCI bus would operate out of specifications. PCI x FSB 33.3 MHz 2.0 x 66.6 MHz = O.k., that's standard. 33.3 MHz 2.5 x 83.3 MHz = Requires proper RAM to even attempt (PC-100, CAS 2, 10ns. minimum); but it's doable and reasonably stable. See http://www.bekkoame.ne.jp/~t-imai/g3ae1.html
Power Mac G3 All-In-One	768 MB	66 MHz or 83 MHz*	*Same as Beige
Power Mac G3 Blue and White, Yosemite	1.0 GB	100 MHz	FSB speed can be changed but not recommended.
Power Mac G4 PCI Graphics, Yikes	1.0 GB	100 MHz
Power Mac G4 AGP Graphics, Sawtooth	2.0 GB	100 MHz
Power Mac G4 Cube	1.5 GB	100 MHz
Power Mac G4 Gigabit Ethernet	2.0 GB	100 MHz
Power Mac G4 Digital Audio	1.5 GB	133 MHz
Power Mac G4 QuickSilver	1.5 GB	133 MHz
Power Mac G4 QuickSilver 2002	1.5 GB	133 MHz
Power Mac G4 Mirrored Drive Doors	2.0 GB	133 MHz	G4 867 MHz
	2.0 GB	167 MHz	G4 1.0 GHz and G4 1.25 GHz
Power Mac G4 Mirrored Drive Doors FW 800	2.0 GB	133 MHz	G4 1.0 GHz
	2.0 GB	167 MHz	G4 1.25 GHz dual processor and G4 1.42 GHz dual processor
Power Mac G4 Mirrored Drive Doors 2003	2.0 GB	167 MHz
Power Mac G5 v1 - PowerPC 970	4.0 GB**	800 MHz	G5 1.6 GHz single processor
	8.0 GB**	900 MHz	G5 1.8 GHz single and dual processor
	8.0 GB**	1000 MHz	G5 2.0 GHz dual processor
Power Mac G5 June 2004 - PowerPC 970FX	4.0 GB**	600 Mhz	G5 1.8 GHz single processor
	4.0 GB**	900 MHZ	G5 1.8 GHz dual processor
	8.0 GB**	1000 MHz	G5 2.0 GHz dual processor
	8.0 GB**	1250 MHz	G5 2.5 GHz dual processor
iMac G5	2.0 GB	533 Mhz	iMac 17" G5 1.6 GHz single processor
	2.0 GB	600 Mhz	iMac 17" G5 1.8 GHz single processor and iMac 20" G5 1.8 GHz single processor
Mac mini	1.0 GB	167 MHz

**Twice the RAM with 2GB modules (when available). Uniform CAS latencies and all-from-the-same-manufacturer installations strongly advised.