Asus P5QL-VM DO User Guide - Page 13

1.4.2 Memory configurations You may install a 512MB, 1GB, 2GB, and 4GB unbuffered non-ECC DDR2 DIMM into the DIMM socket. • 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. • For dual-channel configuration, you can: - install two identical DIMMs in DIMM_A1 and DIMM_B1; or - install four identical DIMMs in all four slots; or - install one identical DIMM pair in DIMM_A1 and DIMM_B1 (yellow slots) and another identical DIMM pair in DIMM_A2 and DIMM_B2 (black slots). • Due to the memory address limitation on the 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 do either of the following: - Install a maximum of 3GB system memory if you are using a 32-bit Windows® OS. - Use a 64-bit Windows® OS if you want to install 4GB or more memory on the motherboard. • This motherboard does not support DIMMs made up of 256 megabits (Mb) chips or less. • This motherboard supports up to 16GB on W�in�d�o�w��s® XP Professional x64 and Windows® Vista x64 editions�. �Y�o�u��m��a�y�i�n�s�t�a�ll�a��m��a�x�i�m�u��m��o�f�4��G�B��D��IM��M��s�o��n�e��a�c�h��s�lo�t�. • The default memory operation frequency is dependent on its Serial Presence Detect (SPD), which is the standard way of accessing information from a memory module. Under the default state, some memory modules for overclocking may operate at a lower frequency than the vendor-marked value. • For system stability, use a more efficient cooling system to support a full memory load (4 DIMMs) or overclocking conditions. P5Q-VM DO Motherboard Qualified Vendors List (QVL) DDR2-800MHz capability Vendor A-Data A-Data A-Data A-Data Apacer Apacer Corsair Corsair Part No. AD2800E001G0U M2GVD6G314170Q1E58 AD2800002GMU AD2800E002GOU 78.91G91.9K5 78.01GA0.9L5 CM2X1024-6400 XMS2-6400 Size SS/ Chip DS Brand 2048MB(Kit of 2) SS N/A 1024MB DS VDATA 2048MB DS Hynix 4096MB(Kit of 2) DS N/A 512MB SS Apacer 1024MB SS Apacer 1024MB DS Corsair 1024MB DS Corsair Chip No. Heat-Sink Package VD29608A8A-25EG80813 Heat-Sink Package Heat-Sink Package AM4B5708JQJS8E0751C AM4B5808FEWS8E0909C Heat-Sink Package Heat-Sink Package Timing DIMM (BIOS) 4-4-4-12 4-4-4-12 5 5 4 DIMM Support Voltage A* B* C* 2.0~2.1V • • • 1.9~2.1V continued on the next page 1-4 Chapter 1: Product introduction