Asus P3PH4 P3-PH4 User''s Manual for English Edition - Page 24

2.5 Installing a DIMM The system motherboard comes with four Double Data Rate 2 (DDR2) Dual Inline Memory Module (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 figure illustrates the location of the DDR2 DIMM sockets. ® DIMM_A1 DIMM_A2 DIMM_B1 DIMM_B2 240-pin DDR2 DIMM sockets Channel Channel A Channel B Sockets DIMM_A1 and DIMM_A2 DIMM_B1 and DIMM_B2 2.5.1 Memory configurations You may install up to 4 GB system memory using 256 MB, 512 MB, and 1 GB DDR DIMMs. • Installing DDR DIMMS other than the recommended configurations may cause memory sizing error or system boot failure. Use any of the recommended configurations in the table on the next page. • Install only i d e n t i c a l (the same type and size) DDR DIMM in DIMM_A and DIMM_B. • Always install DIMMs with the same CAS latency. For optimum compatibility, we recommend that you obtain memory modules from the same vendor. • Due to chipset resource allocation, the system may detect less than 4 GB system memory when you installed four 1 GB DDR memory. • This motherboard does not support memory modules made up of 128 Mb chips or double-sided x16 memory modules. 2-8 Chapter 2: Basic installation