Asus P55SP4 P/I-P55SP4 User's manual - Page 26

Upgrade Guide Configuring System Memory If you want to add system memory, you should use the configuration options and specifications shown in this section. Memory Combinations You can configure the system memory in a variety of ways, using different combinations of SIMM modules. Using the 4 SIMM sockets there are many configuration options. Please note: • Modules must be installed in pairs, in sequence, i.e. SIMM 1 & 2, SIMM 3 & 4, or all four sockets. The exception is you can install one single-sided >2MB module in the SIMM 1 socket. • Modules pairs must be the same size. • Required Specifications: Module Size: Single-sided SIMMS: 1MB, 4MB, 16MB, 64MB Double-sided SIMMS: 2MB, 8MB, 32MB, 128MB DRAM Type: Fast Page Mode, Asymmetric or Extended Data Output DRAM Speed: 70ns or faster for 50, 60 or 66MHz external clock. EDO DRAM requires 60ns or faster for a 66MHz external clock setting. RAS access time [Trac]: 60ns - 70ns CAS access time [Tcac]: l0ns - 25ns Parity: Either parity or non-parity 2 - 7