Asus F2A55-M manual Memory configurations, DDR3-2250 O.C. MHz capability

1.5.2Memory 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.

•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.

•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.

F2A85-M Motherboard Qualified Vendors Lists (QVL)

DDR3 2400 (O.C.) MHz capability

Vendors	Part No.	Size	SS/	Chip	Chip NO.	Timing	Voltage	DIMM socket support (Optional)
			DS	Brand				1 DIMM	2 DIMMs	4 DIMMs
G.SKILL	F3-19200CL9D-	4GB(2x 2GB)	DS	-	-	9-11-9-28	1.65V	•	•
	4GBPIS(XMP)
Kingmax	FLLE88F-C8KKAA	2GB	SS	-	-	10-11-10-30	1.8V	•	•	•
	HAIS(XMP)
Team	TXD34096M2400	4GB	DS	SEC 128	K4B2G0846D	9-11-11-28	1.65V	•	•
	HC9N-L			HCH9
Team	TXD34096M2400	4GB	DS	SEC 128	K4B2G0846D	9-11-11-28	1.65V	•	•
	HC9N-L			HCH9

DDR3-2250 (O.C.) MHz capability

Vendors	Part No.	Size	SS/DS	Chip	Chip NO.	Timing	Voltage	DIMM socket support (Optional)
				Brand				1 DIMM	2 DIMMs	4 DIMMs
Kingston	KHX2250C9D3T1K2/4GX(XMP)	4GB(2x 2GB)	DS	-	-	-	1.65V	•	•	•

1-12 Chapter 1: Product introduction