Computers / Components / Memory / Memory Speed 1800 MHz, Capacity 4096 MB 

Kingston KHX1800C8D3K2/4G

DDR3, Capacity 4096 MB, Memory speed 1800 MHz, PC14400, CL 8 ms, 200 pin

Corsair TW3X4G1800C8DF

DDR3, Capacity 4096 MB, Memory speed 1800 MHz, PC14400, CL 8 ms, 240 pin

Kingston KHX14400AD3K2/4G

DDR3, Capacity 4096 MB, Memory speed 1800 MHz, PC14400, CL 8 ms, 200 pin