Memory configurations

You may install 1GB, 2GB, 4GB, and 8GB unbuffered and non‑ECC DDR3 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.

•According to Intel CPU specification, DIMM voltage below 1.65V is recommended to protect the CPU.

•Due to Intel® chipset limitation, DDR3 1600 MHz and higher memory modules on XMP mode will run at the maximum transfer rate of DDR3 1600 MHz.

•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:

a)Use a maximum of 3GB system memory if you are using a 32-bit Windows® OS.

b)Install a 64-bit Windows® OS when you want to install 4GB or more on the motherboard.

c)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 512Mb (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 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. To operate at the vendor-marked or at a higher frequency, refer to section 3.5 Ai Tweaker menu for manual memory frequency adjustment.

•For system stability, use a more efficient memory cooling system to support a full memory load (4 DIMMs) or overclocking condition.

•Always install the DIMMS with the same CAS Latency. For an optimum compatibility, we recommend that you install memory modules of the same version or data code (D/ C) from the same vendor. Check with the vendor to get the correct memory modules.

•Visit the ASUS website at www.asus.com for the Qualified Vendors Lists (QVL).

Chapter 1

ASUS H87-PLUS

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