Asus ESC1000 G2 User Guide - Page 31

2.4.2 Memory configurations You may install 1GB, G2B, 4GB, 8GB unbuffered ECC or non‑ECC DDR3 DIMMs into the DIMM sockets depending on the installed CPU. • You may install varying memory sizes in Channel A and Channel B, Channel C and Channel D. The system maps the total size of the lower-sized channel for the dualchannel configuration. Any excess memory from the higher-sized channel is then mapped for single-channel operation. • Due to Intel spec definition, X.M.P. DIMMs and DDR3-1600 are supported for one DIMM per channel only. • According to Intel CPU spec, DIMM voltage below 1.65V is recommended to protect the CPU. • The max. 64GB memory capacity can be supported with DIMMs of 8GB (or above). ASUS will update QVL once the DIMMs are available on the market. • Always install DIMMs with the same CAS latency. For optimum compatibility, we recommend 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 do any of the following: - Use a maximum of 3GB system memory if you are using a 32-bit Windows OS. - Install a 64-bit Windows OS when you want to install 4GB or more on the motherboard. - For more details, refer to the Microsoft® support site at http://support.microsoft.com/kb/929605/en-us. • This motherboard does not support DIMMs made up of 512 Mb (64MB) chips or less (Memory chip capacity counts in Megabit, 8 Megabit/Mb = 1 Megabyte/MB). • The default memory operation frequency is dependent on its SPD. 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 memory cooling system to support a full memory load (8 DIMMs) or overclocking condition. ASUS ESC1000 G2 2-11