ASUS F2A55 User Manual

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.

• 

We recommend that you install the memory modules from the blue slots for better 

overclocking capability.

• 

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.

• 

When overclocking, some AMD CPU models may not support DDR3 1866 MHz 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:

 

- 

 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 64GB 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 (4 DIMMs) or overclocking condition.

G.SKILL F3-19200CL9D-4GBPIS(XMP) 4GB 

(2x 2GB) DS -

-

9-11-9-28

1.65V

•

•

Kingmax FLLE88F-C8KKAA HAIS(XMP) 2GB

SS -

-

10-11-10-30 1.8V

•

•

•

Team

TXD34096M2400HC9N-L

4GB

DS SEC 128 HCH9 K4B2G0846D 9-11-11-28 1.65V

•

•

Team

TXD34096M2400HC9N-L

4GB

DS SEC 128 HCH9 K4B2G0846D 9-11-11-28 1.65V

•

•

Kingston KHX2250C9D3T1K2/4GX(XMP) 4GB(2x 2GB) DS

-

-

-

1.65V

•

•

•

Chapter 1: Product introduction

1-12