G.SKILL 4GB 204-Pin DDR3 SO-DIMM DDR3 1066 (PC3 8500) Laptop Memory Model F3-8500CL7S-4GBSQ, Color May Vary Capacity 4GB, Speed DDR3 1066 (PC3 8500) Cas Latency 7, Timing 7-7-7-20 Voltage 1.5V, no ECC Unbuffered