OCZ OCZ3RPR18002GK DDR3 1800MHz 2 GB Kit Reaper HPC Reaper HPC Heatsink/ 1.95V EVP 8-8-8-27/CAS-TRCD-TRP-TRAS) 1800MHz DDR3/Unbuffered 1.9 Volts/240 Pin DIMM Available in 2 GB and 4 GB Dual Channel Kits