Asus Maximus II Gene - Manual (Page 40)

2.4.2 Memory configurations
You may install 512MB, 1GB, 2GB and 4GB unbuffered, non-ECC DDR2 DIMMs
into the DIMM sockets.
• 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 3.3 Extreme 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.
• 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,
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 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.
2-16 Chapter 2: Hardware information