Q. What Memory and Drives fit in my iMac PowerPC?

The Apple iMac has shipped in several versions.  The earliest ones ran the PowerPC processors, G3, G4 and G5.

Lists of RAM and drive compatibility for all Macs

Model / Identifier CPU/ Speed/ Screen/ Date/ Designation RAM Type & Speed Maximum RAM Hard Drive/ SSD
iMac G3 (PowerPC)
iMac,1
G3 233 MHz Original Bondi (Rev. A M6709LL/A, Rev. B M6709LL/B, Tray load CD Mid 1998) PC66 SODIMM Rev A: 384 MB (128 M + 256 M)
Rev B: 512 MB (2×256 M)
3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
iMac,1
G3 266 MHz (Tray Load CD Fruit Colors Mid 1999) PC66 SODIMM 512 MB (2×256 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
iMac,1
G3 333MHz (Tray Load CD Fruit Colors Mid 1999) PC66 SODIMM 512 MB (2×256 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
PowerMac2,1
G3 350MHz (Slot Loading CD Blueberry Late 1999) PC100/133 DIMM 1 GB (2×512 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
PowerMac2,1
G3 400 MHz DV (Slot Loading DVD Fruit colored, Firewire, Late 1999) PC100/133 DIMM 1 GB (2×512 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
PowerMac2,1
G3 400 MHz DV SE (Slot Loading DVD Graphite, Firewire, Late 1999) PC100/133 DIMM 1 GB (2×512 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
PowerMac2,2
G3 350MHz (Slot Loading CD Indigo, Mid 2000) PC100/133 DIMM 1 GB (2×512 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
PowerMac2,2
G3 400MHz DV (Slot Loading DVD Firewire, Indigo or Ruby, Mid 2000) PC100/133 DIMM 1 GB (2×512 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
PowerMac2,2
G3 450MHz DV+ (Slot Loading DVD Firewire, Sage, Indigo, Ruby Mid 2000) PC100/133 DIMM 1 GB (2×512 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
PowerMac2,2
G3 500MHz DV SE (Slot Loading DVD Firewire Graphite, Snow, Mid 2000) PC100/133 DIMM 1 GB (2×512 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
PowerMac4,1
G3 400MHz (Slot Loading CD Firewire, Indigo, Early 2001) PC100/133 DIMM 1 GB (2×512 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
PowerMac4,1
G3 500MHz (Slot Loading CD, Flower Power , Indigo, Blue Dalmation, Firewire Early 2001) PC100/133 DIMM 1 GB (2×512 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
PowerMac4,1
G3 600MHz SE (Slot Loading CD Graphite, Flower Power, Firewire, Early 2001) PC100/133 DIMM 1 GB (2×512 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
PowerMac4,1
G3 500 MHz (Slot Loading CD, Indigio, Snow, Mid 2001) PC100/133 DIMM 1 GB (2×512 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
PowerMac4,1
G3 600 MHz (Slot Loading CD Indigo, Snow, Mid 2001) PC100/133 DIMM 1 GB (2×512 M) 3.5″ PATA hard drive up to 120 GB max
iMac G3 (PowerPC)
PowerMac4,1
G3 700 MHz SE (Slot Loading CD, Mid 2001) PC100/133 DIMM 1 GB (2×512 M) 3.5″ PATA hard drive up to 120 GB max
iMac G4 (PowerPC)
PowerMac4,2
G4 700 MHz (15″ Flat Panel Early 2002) PC133 SODIMM + DIMM 1 GB (512 MB SODIMM + 512 MB DIMM) 3.5″ PATA hard drive
iMac G4 (PowerPC)
PowerMac4,2
G4 800 MHz (15″ Flat Panel Early 2002) PC133 SODIMM + DIMM 1 GB (512 MB SODIMM + 512 MB DIMM) 3.5″ PATA hard drive
iMac G4 (PowerPC)
PowerMac4,5
G4 800 MHz (17″ Flat Panel, Mid 2002) PC133 SODIMM + DIMM 1 GB (512 MB SODIMM + 512 MB DIMM) 3.5″ PATA hard drive
iMac G4 (PowerPC)
PowerMac4,2
G4 800 MHz OSX Only (15″ Flat Panel Early 2003) PC133 SODIMM + DIMM 1 GB (512 MB SODIMM + 512 MB DIMM) 3.5″ PATA hard drive
iMac G4 (PowerPC)
PowerMac6,1
G4 1.0 GHz (17″ Flat Panel Early 2003) DDR-266 SODIMM + DIMM 2 GB (1G DIMM + 1 GB SODIMM) 3.5″ PATA hard drive
iMac G4 (PowerPC)
PowerMac6,1
G4 1.0 GHz (15″ Flat Panel USB 2.0 Late 2003) DDR-333 SODIMM + DIMM 2 GB (1G DIMM + 1 GB SODIMM) 3.5″ PATA hard drive
iMac G4 (PowerPC)
PowerMac6,1
G4 1.25 GHz (17″ Flat Panel USB 2.0 Late 2003) DDR-333 SODIMM + DIMM 2 GB (1G DIMM + 1 GB SODIMM) 3.5″ PATA hard drive
iMac G4 (PowerPC)
PowerMac6,3
G4 1.25 GHz (20″ Flat Panel USB 2.0, Late 2003) DDR-333 SODIMM + DIMM 2 GB (1G DIMM + 1 GB SODIMM) 3.5″ PATA hard drive
iMac G5 (PowerPC)
PowerMac8,1
G5 1.6 GHz (17″ Mid 2004) DDR400 DIMM 2 GB (2x1G) 3.5″ SATA HD
iMac G5 (PowerPC)
PowerMac8,1
G5 1.8 GHz (17″ Mid 2004) DDR400 DIMM 2 GB (2x1G) 3.5″ SATA HD
iMac G5 (PowerPC)
PowerMac8,1
G5 1.8 GHz (20″ Mid 2004) DDR400 DIMM 2 GB (2x1G) 3.5″ SATA HD
iMac G5 (PowerPC)
PowerMac8,2
G5 1.8 GHz (17″ Ambient Light Sensor, Mid 2005) DDR400 DIMM 2 GB (2x1G) 3.5″ SATA HD
iMac G5 (PowerPC)
PowerMac8,2
G5 2.0 GHz (17″ Ambient Light Sensor, Mid 2005) DDR400 DIMM 2 GB (2x1G) 3.5″ SATA HD
iMac G5 (PowerPC)
PowerMac8,2
G5 2.0 GHz (20″ Ambient Light Sensor Mid 2005) DDR400 DIMM 2 GB (2x1G) 3.5″ SATA HD
iMac G5 (PowerPC)
PowerMac12,1
G5 1.9 GHz (17″ iSight, Late 2005) DDR2-533 DIMM 2.5 GB (512 Mbuilt in plus 1 x 2 G DIMM) 3.5″ SATA HD
iMac G5 (PowerPC)
PowerMac12,1
G5 2.1 GHz (20″ iSight, Late 2005) DDR2-533 DIMM 2.5 GB (512 M built in plus 1 x 2 G DIMM) 3.5″ SATA HD
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