Asus A55M-A USB3 A55M-A User's Manual - Page 24

Memory configurations

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1.5.2 Memory configurations You may install 1GB, 2GB, 4GB, and 8GB unbuffered 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 optimal compatibility, we recommend that you install memory modules of the same version or date code (D/C) from the same vendor. Check with the retailer to get the correct memory modules. • 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 motherboard. • This motherboard does not support DIMMs made up of 512Mb (64MB) 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. • 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 efficient memory cooling system to support a full memory load (2 DIMMs) or overclocking condition. A55M-A Series Motherboard Qualified Vendors Lists (QVL) DDR3 1866 MHz capability Vendors Part No. Size SS/DS Chip Brand CORSAIR CMT6GX3MA1866C9(XMP) 6GB(3 x 2GB) DS - CORSAIR CMZ8GX3M2A1866C9(XMP) 8GB(2 x 4GB) DS - G.SKILL F3-14900CL9Q-16GBZL(XMP1.3) 16GB(4GB x 4) DS - G.SKILL F3-14900CL10Q2-64GBZLD(XMP1.3) 64GB(8GB x 8) DS - KINGSTON KHX1866C9D3K4/16GX(XMP) 16GB(4GB x 4) DS - KINGSTON KHX1866C9D3T1K3/6GX(XMP) 6GB(3 x 2GB) DS - KINGSTON KHX1866C11D3P1K2/8G 8GB(4GB x 2) DS - KINGSTON KHX1866C9D3K2/8GX(XMP) 8GB(4GB x 2) DS - Chip NO. Timing DIMM socket Voltage support (Optional) 1 DIMM 2 DIMMs - 9-9-9-24 1.65V • • - 9-10-9-27 1.50V • • - 9-10-9-28 1.5V • • - 10-11-10-30 1.5V • • - - 1.65V • • - - 1.65V • • - - 1.5V • • - - 1.65V • • 1-12 Chapter 1: Product introduction

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1.5.2
Memory configurations
You may install 1GB, 2GB, 4GB, and 8GB unbuffered 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 optimal compatibility, we
recommend that you install memory modules of the same version or date code (D/C)
from the same vendor. Check with the retailer to get the correct memory modules.
•
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
motherboard.
•
This motherboard does not support DIMMs made up of 512Mb (64MB) 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.
•
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 efficient memory cooling system to support a full
memory load (2 DIMMs) or overclocking condition.
A55M-A Series Motherboard Qualified Vendors Lists (QVL)
Vendors
Part No.
Size
SS/DS
Chip
Brand
Chip NO.
Timing
Voltage
DIMM socket
support (Optional)
1 DIMM
2 DIMMs
CORSAIR
CMT6GX3MA1866C9(XMP)
6GB(3 x 2GB)
DS
-
-
9-9-9-24
1.65V
•
•
CORSAIR
CMZ8GX3M2A1866C9(XMP)
8GB(2 x 4GB)
DS
-
-
9-10-9-27
1.50V
•
•
G.SKILL
F3-14900CL9Q-16GBZL(XMP1.3)
16GB(4GB x 4)
DS
-
-
9-10-9-28
1.5V
•
•
G.SKILL
F3-14900CL10Q2-64GBZLD(XMP1.3)
64GB(8GB x 8)
DS
-
-
10-11-10-30 1.5V
•
•
KINGSTON
KHX1866C9D3K4/16GX(XMP)
16GB(4GB x 4)
DS
-
-
-
1.65V
•
•
KINGSTON
KHX1866C9D3T1K3/6GX(XMP)
6GB(3 x 2GB)
DS
-
-
-
1.65V
•
•
KINGSTON
KHX1866C11D3P1K2/8G
8GB(4GB x 2)
DS
-
-
-
1.5V
•
•
KINGSTON
KHX1866C9D3K2/8GX(XMP)
8GB(4GB x 2)
DS
-
-
-
1.65V
•
•
DDR3 1866 MHz capability
Chapter 1: Product introduction
1-12