Crucial Ballistix PC-3200
Densities: 256MB, 512MB
Package: 184-pin DIMM
Feature: PC-3200 (DDR-400)
Configurations: 32Meg x 64, 64Meg x 64
DIMM Type: Unbuffered
Error Checking: Non-parity
Voltage: 2.8V +/- 0.2V
SDRAM Timings: 2-3-2-6
Rank Configuration: 512MB dual ranked, 256MB single ranked
Heat Spreader: Aluminum

Crucial Ballistix PC-4000
Module Sizes: 256MB, 512MB
Package: 184-pin DIMM
Feature: PC-4000 (DDR-500)
Configurations: 32Meg x 64, 64Meg x 64
DIMM Type: Unbuffered
Error Checking: Non-parity
Voltage: 2.8V +/- 0.2V
SDRAM Timings: 2.5-4-4-8
Rank Configuration: 512MB dual ranked, 256MB single ranked
Heat Spreader: Aluminum

Crucial Ballistix PC2-4200
Module Sizes: 256MB, 512MB
Package: 240-pin DIMM
Feature: PC2-4200 (DDR2-533)
Configurations: 32Meg x 64, 64Meg x 64
DIMM Type: Unbuffered
Error Checking: Non-parity
Voltage: 1.9V +/- 0.1V
SDRAM Timings: 3-3-3-10 (4-4-4-12 timings, but supports 3-3-3-10)
Rank Configuration: 512MB dual ranked, 256MB single ranked
Heat Spreader: Aluminum

Crucial Ballistix PC2-5300
Module Sizes: 256MB, 512MB
Package: 240-pin DIMM
Feature: PC2-5300 (DDR2-667)
Configurations: 32Meg x 64, 64Meg x 64
DIMM Type: Unbuffered
Error Checking: Non-parity
Voltage: 1.9V +/- 0.1V
SDRAM Timings: 4-4-4-10 (5-5-5-12 timings, but supports 4-4-4-10)
Rank Configuration: 512MB dual ranked, 256MB single ranked
Heat Spreader: Aluminum