2-6 Chapter 2: Hardware information
Chapter 2
Memory congurations
You may install 1GB, 2GB and 4GB 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.
• 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 CPU spec., AMD AM3 100 series CPUs support up to DDR3 1066MHz.
With ASUS design, this motherboard can support up to DDR3 1333MHz.
• When overclocking, some AMD CPU models may not support DDR3 1600 or higher
frequency DIMMs.
• 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 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
3.4 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.
M5A99X EVO Motherboard Qualied Vendors Lists (QVL)
DDR3 2000 MHz capability for AM3+ CPU
Vendor Part No. Size
SS/
DS
Chip
Brand
Chip NO. Timing Voltage
DIMM socket support
(Optional)
1 DIMM 2 DIMM 4 DIMM
A-DATA AX3U2000GB2G9B(XMP) 2GB DS - - 9-11-9-27 1.55~1.75 • •
CORSAIR CMT6GX3M3A2000C8(XMP) 6GB ( 3x 2GB ) DS - - 8-9-8-24 1.65 • • •
Crucial BL12864BE2009.8SFB3(EPP) 1GB SS - - 9-9-9-28 2 •
KINGSTON KHX2000C9AD3T1K3/6GX(XMP) 6GB ( 3x 2GB ) DS - - - 1.65 • • •
AEXEA AXA3ES4GK2000LG28V(XMP) 4GB ( 2x 2GB ) DS - - - 1.65 • • •
Silicon Power SP002GBLYU200S02(XMP) 2GB DS - - - - • • •
Team TXD32048M2000C9-L(XMP) 2GB DS Team T3D1288RT-20 9-9-9-24 1.6 •
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