As per Notebook limitation, at the moment, 945PM notebook only support up to 3GB Memory. Specification Capacity: 2GB (2GB x 1) Speed: 667MHz DDR2 (PC2-5300) CAS Latency: CL5 Test Voltage: 1.8 Volts PCB: 6 Layers PCB Registered/Unbuffered: Unbuffered Error Checking: Non-ECC Type: 200-pin so-DIMM Warranty: Lifetime

1GB 667MHz DDR2 Non-ECC CL5 SODIMM Standard 128M X 64 Non-ECC 667MHz 200-pin Unbuffered SODIMM (SDRAM-DDR2, 1.8V, CL5)

2GB 667MHz DDR2 Non-ECC CL5 SODIMM Standard 256M X 64 Non-ECC 667MHz 200-pin Unbuffered SODIMM (SDRAM-DDR2, 1.8V, CL5)