Corsair XMS2 2 GB (2 X 1 GB 240-pin DDR2 800Mhz Dual Channel Memory Kit The Twin2X2048-6400C4 is a 2048 MByte matched pair of DDR2 SDRAM DIMMs This part delivers outstanding performance in the latest generation of dual-channel DDR2-based motherboards 2x128Mx64nonECC 240 DIMM unbuffered 4-4-4-12, 64Mx8 DRAMS EPP Technology, matched pair with HeatSpreader Memory Type: DDR2; Speed: 800MHz