Asus Crosshair III Formula - Manual (Page 44)

2.4.2 Memory configurations
You may install 512 MB, 1 GB, 2 GB and 4 GB unbuffered ECC 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.
• It is recommended to install the memory modules from the orange slots for
better overclocking capability.
• 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 DIMMs made up of 256 megabit (Mb)
chips or less.
• 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. To operate at the vendor-
marked or at a higher frequency, see section 3.5 Advanced 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.
2-16 Chapter 2: Hardware information