"The default speed on this memory is 1100MHz DDR3 or PC2-8800 and memory timing is 5-5-5-15 (CAS-TRCD-TRP-TRAS). With a low voltage of 1.8, a fast memory speed and a reasonably tight memory timing, the G.SKILL DDR2 Pi series PC2-8800 memory is the memory to get. Not only that, it's available in 4GB and 8GB kits."