Asus P5Q-EM DO User Manual - Page 28

1.7.2 Memory configurations You may install 512 MB, 1 GB, 2GB, and 4 GB unbuffered non‑ECC DDR2 DIMMs into the DIMM sockets. • You may install varying memory sizes in Channel A and Channel B. The system maps the total size of the lower-sized channel for the dual-channel configuration. Any excess memory from the higher-sized channel is then mapped for single-channel operation. • 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 the memory address limitation on 32-bit Windows OS, when you install 4GB or more memory on the motherboard, the actual usable memory for the OS can be about 3GB or less. For effective use of memory, we recommend that you install a 64-bit Windows OS when having 4GB or more memory installed on the motherboard�. • This motherboard does not support memory modules made up of 256 megabit (Mb) chips or less. • This motherboard supports Intel® ME technology. Your system may detects less memory size than that you installed when Intel® ME function is enabled. Refer to the following table for details. Memory reserved by Intel® ME DIMM A1 Installed Memory slots DIMM A2 DIMM B1 Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed Installed DIMM B2 Installed Installed Installed Installed Installed Installed Installed Installed Total memory occupied by Intel® ME 1GB / slot 2GB / slot 16MB 16MB 16MB 0MB 0MB 16MB 32MB 32MB 32MB 0MB 32MB 32MB 32MB 32MB 32MB 64MB 16MB 0MB 0MB 64MB 64MB 64MB 64MB 0MB 64MB 64MB 64MB 64MB 64MB 64MB 1-14 P5Q-EM DO.indb 14 Chapter 1: Product introduction 12/9/08 12:33:42 PM