CORSAIR XMS2 PRO 2GB ( 2 x 1GB ) PC2-6400 800MHz 240-Pin DDR2 CL4 Dual Channel Desktop Memory Kit - TWIN2X2048-6400C4PRO DDR2 XMS2-6400 2x128Mx64nonECC 2x240 DIMM unbuffered 4-4-4-12, 64Mx8 DRAMS EPP Technology, TwinX PRO Series with activity LEDS