Lifetime 2GB DDR2 PC2-4200 Mac Pro Memory Upgrade (2x1GB DIMM)

Double-Data-Rate II Fully Buffered Dual Inline Memory Modules W/ Apple Heat Sinks (DDR2 FB DIMMs HS) - Designed specifically for full Apple compatibility, these DDR2 Fully Buffered DIMMs reduce the load on your Apple's memory bus by integrating registers independent from the memory itself, all the while sporting heat sinks engineered to keep temperatures down and operation stable regardless of demanding applications.