Asus P5GD2 Deluxe P5GD2 Premium user''s manual - Page 37

2.4 System memory 2.4.1 Overview The motherboard comes with four 240-pin Double Data Rate 2 (DDR2) Dual Inline Memory Modules (DIMM) sockets. A DDR2 module has the same physical dimensions as a DDR DIMM but has a 240-pin footprint compared to the 184-pin DDR DIMM. DDR2 DIMMs are notched differently to prevent installation on a DDR DIMM socket. The following figure illustrates the location of the sockets: P5GD2 Premium DIMM_A1 DIMM_A2 DIMM_B1 DIMM_B2 ® P5GD2 Premium DDR2 DIMM Sockets 2.4.2 Memory Configurations You may install 256 MB, 512 MB and 1 GB unbuffered non-ECC DDR2 DIMMs into the DIMM sockets using the memory configurations in this section. • Installing DDR2 DIMMs other than the recommended configurations may cause memory sizing error or system boot failure. Use any of the recommended configurations in Table 1. • In dual-channel configurations, install only i d e n t i c a l (the same type and size) DDR2 DIMM pairs for each channel. • Always install DIMMs with the same CAS latency. For optimum compatibility, it is recommended that you obtain memory modules from the same vendor. • Due to chipset resource allocation, the system may detect less than 4 GB of system memory when you installed four 1 GB DDR2 memory modules. • Due to chipset limitation, 128 MB or double-sided x16 memory modules are not supported in this motherboard. ASUS P5GD2 Premium 2-13