CORSAIR XMS PRO 2GB ( 2 X 1GB ) PC2-6400 800MHz 240-pin DDR2 Dual Channel Memory Kit DDR2 XMS2-6400 2x128Mx64non-ECC 240 DIMM, unbuffered 5-5-5-12, 64Mx8 DRAMS TwinX PRO Series with Activity LED's