For 2010 MacPro Tower with these processors:
Dual 2.66 GHz and 2.93 GHz 'Westmere' (8 RAM slots)
Single 3.33 Ghz 'Westmere' (4 RAM slots)
note: does not require installation in pairs

For 2010 MacPro with these Processors:
Dual 2.4 GHz 'Westemere' - Single 2.8 Ghz and 3.2 Ghz 'Nehalem'
2010 MacPro5,1 Max 96 GB in Dual Processor models and max 64 GB in Single Processor models

For all 2009 'Nehalem' MacPro Towers - 2.26, 2.66, 2.93 and 3.33 GHz Dual and Single
2009 MacPro4,1 Max 64 GB in Dual Processor models and Max 32 GB in Single Processor models

note: unlike previous models does not require installation in pairs

For all 2010 Intel i3, i5 and i7 Processor iMacs

note: does not require installation in pairs

Mid 2009-10 MacBook, MacBookPro, iMac and Mini
These have 2 slots and can support up to 4 GB Modules in each slot

Oct 2008 MacBookPro and MacBook
These have 2 slots and can support up to 2 GB Modules in each slot

Oct 2008 17inch MacBookPro with Built in Battery
These have 2 slots and can support up to 4 GB Modules in each slot

Early 2009 iMac and Mini
These have 2 slots and can support up to 2 GB Modules in each slot

For all 2008 MacPro Towers
Note: MacPro Towers require RAM modules to be installed in pairs.
Purchase modules in pairs, example: 4 GB upgrade is two x 2 GB Modules

For all 2007 MacPro Towers
Note: MacPro Towers require RAM modules to be installed in pairs.
Purchase modules in pairs, example: 4 GB upgrade is two x 2 GB Modules

2007 - 2008 MacBookPro
MBP 2.2GHz or faster has 2 slots and can support 4 GB Module - to a maximum of 6GB (one 2 and one 4GB module)

2007 - 2008 Intel iMac
24" 2.8 GHz or 3.0 GHZ and 20" 2.0 thru 2.8 GHz can use up to 4 GB
for 17inch 2.0 GHz and 2.16 GHz Maximum is 3 GB.
20 and 24 inch 2.16 GHz and 2.33 GHz Max 3 GB

For 2006 MacBook and MacBookPro
MacBooks and MBPro have 2 slots that can each support 1 GB modules or smaller

2006 MacIntel iMac and MacIntel Mini
Intel iMac and Mini have 2 slots that can each take a 1 GB module or smaller.

2008 Intel iMac - Model Identifier iMac8,1
20" 2.4 GHz or 2.66 GHZ Core Duo
24inch 2.8 GHz and 3.06 GHz Core Duo
Max RAM for all models is 4 GB

For 2005 'iSight' iMac G5 with PCI-Express Graphics
2005 Dual Core G5 with PCI-Express
Note: G5 Towers require RAM modules to be installed in pairs.
Purchase modules in pairs, example: 1 GB upgrade is two 512MB Modules
You can install single module in iMac

for G5 1.6GHz 1.8GHz, 2GHz, Dual 1.8GHz, Dual 2GHz, Dual 2.5GHz, Dual 2.7Ghz
Our Lab has performed substantial testing in new Revision2 G5s and iMac G5.
These are fully compatible and can be installed individually in G5 iMacs.
Note: G5 Towers require RAM modules to be installed in pairs.
Purchase modules in pairs, example: 1 GB upgrade is two 512MB Modules
Can also be used in all Macs requiring PC2100 and PC2700 modules.

15 and 17 inch 1.67 GHz
Note: 12 inch 1.5 GHz uses PC2700

for G4 models
AGP, Gigabit, Digital Audio, Quicksilver, and Cube
eMac 700 through 1 GHz models

for G4 Titanium 667-800 MHz
15"PowerBook G4 DVI and GigaBit Ethernet- 550,667,800 MHz and 1 GHz
iBook 500 MHz through 900 MHz
Pismo/iMac 700-800MHz

for G3 Lombard PowerBook, Bronze Keyboard PowerBook, Wallstreet
iMac BondiBlue, 5 Flavors iMac, Original iBook and Firewire iBook (300 through 466 MHz)

iMac 350 - 500 MHz Indigo
for iMac 350, 400DV, 450DV, 500DV, DV+450, DV SE 500
Perigree and Kiva models from 400 through 700 MHz.

for 66 and 100 MHz bus G3 and G4 models
Beige, All in One, B&W
Yikes-PCI Graphics G4
Note: This is the correct 125 MHz (8NS) RAM designed to run perfectly in the Beige, AIO, B&W and Yikes .

for 7300, 7500, 7600, 8500, 8600, 9500, 9600
5200, 5300.
UMAX S900, S910, C700, C600, and C500
Power Computing: PowerWave
Many Vintage Macs can use FPM or EDO RAM.
Check the PCI EDO RAM Guide

for Power Tower, Power Tower Pro, Power Center, Power Center Pro
Many Vintage Macs can use FPM or EDO RAM.
Check the PCI PowerMac RAM Guide
Check the PowerComputing Compatibility Guide

Performa 630 to 640 ,Performa 5200 ,6200, Performa 6110CD to 6118CD
Performa 450, 460, 466, 467, 475, 476, 550, 560, 575, 577, 578, & 580CD
Quadra 605, 610, 630, 650, 660av, 800, 840av
Apple Workgroup Servers 60 & 80 - Centris 610, 650, 660AV
Requires matched pairs: 6100, 7100, 8100 Power Computing Power100