Type    DDR2
Size    4096 MBytes
Channels #    Dual
DRAM Frequency    400.0 MHz
CAS# Latency (CL)    5 clocks
RAS# to CAS# Delay (tRCD)    5 clocks
RAS# Precharge (tRP)    5 clocks
Cycle Time (tRAS)    18 clocks
Command Rate (CR)    2T

for the above specs, need 2 sticks x 2 gig.

4 x DIMM, Max. 8 GB, DDR2 1200/1066/800/667 Non-ECC,Un-buffered Memory
Dual Channel memory architecture