Best prices on 400 MHz - 600 MHz in RAM & Memory Upgrades. Check out BizRate for great deals on RAM & Memory Upgrades from HP, Axiom and Kingston Technology. Use BizRate's latest online shopping features to compare prices for 400 MHz - 600 MHz. Read product specifications, calculate tax and shipping charges, sort your results, and buy Computers & Software with confidence. Easily narrow your search and find the product that's perfect for you: Crucial 2 GB DDR2 SODIMM Laptop Memory - Crucial 4 GB PC3-8500 204-pin DDR3 SDRAM SODIMM Kit.