• 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 conguration. 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 do any 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 you want to install 4GB or more memory on the
motherboard.
• This motherboard does not support DIMMs made up of 512 megabits (Mb) chips or less.
• The maximum 32GB memory capacity can be supported with 16GB or above DIMMs.
ASUS will update the memory QVL once the DIMMs are available in the market.
1.7.2 Memory congurations
You may install 1GB, 2GB, 4GB, and 8GB unbuffered non-ECC DDR3 DIMMs into the DIMM
sockets.
• 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 2.4 Ai Tweaker menu for manual memory frequency
adjustment.
• For system stability, use a more efcient memory cooling system to support a full
memory load (2 DIMMs) or overclocking condition.
F1A55-M LX Series Motherboard Qualied Vendors Lists (QVL)
DDR3-2250(O.C.)MHz capability
Vendors Part No. Size SS/DS Chip Brand Chip NO. Timing Voltage
DIMM socket
support (Optional)
A* B*
KINGSTON KHX2250C9D3T1K2/4GX(XMP) 4GB ( 2x 2GB ) DS - - - 1.65V • •
DDR3-2200(O.C.)MHz capability
Vendors Part No. Size SS/DS Chip Brand Chip NO. Timing Voltage
DIMM socket
support (Optional)
A* B*
KINGMAX FLKE85F-B8KJA FEIH(XMP) 4GB(2 x 2GB) DS - - - 1.5V-1.7V • •
ASUS F1A55-M LX Series 1-11
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