1.7.2Memory configurations

You may install 512MB, 1GB, 2GB, and 4GB unbuffered ECC and non-ECC DDR2 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 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 256 megabits (Mb) chips or less.

The motherboard supports up to 16GB memory modules on Windows® XP Professional x64 and Vista x64 editions. You may install a maximum of 4GB DIMMs on each slot.

M4A78-EM Motherboard Qualified Vendors Lists (QVL)

DDR2-1066MHz capability

 

 

 

SS/

 

 

Chip

 

DIMM

Size

Vendor

Part No.

CL

Chip No.

support

 

 

 

DS

 

 

Brand

A*

B* C*

512MB

Kingston

KHX8500D2/512

SS

N/A

Heat-Sink Package

Kingston

·

·

512MB

Kingston

KVR1066D2N7/512

SS

N/A

E5108AJBG-1J-E

Elpida

·

·

512MB

Kingston

KHX8500D2K2/1GN

SS

N/A

Heat-Sink Package

Kingston

·

·

1G

Kingston

KHX8500D2K2/2GN

DS

N/A

Heat-Sink Package

Kingston

·

·

1G

Kingston

KVR1066D2N7/1G

DS

N/A

E5108AJBG-1J-E

Elpida

·

·

1G

Kingston

KHX8500D2/1G

DS

N/A

Heat-Sink Package

Kingston

·

·

1G

Qimonda

HYS64T128020EU-19F-C

DS

6

HYB18T512800CF19FFSS24313

Qimonda

·

·

1G

Kingmax

KLED48F-A8K15

DS

N/A

KKA8FFIXF-JFS-18A

Kingmax

·

·

1G

Crucial

BL12864AA1065.8FE5

SS

5-5-5-15

Heat-Sink Package

N/A

·

·

1G

Transcend

TX1066QLJ-2GK1GB

DS

5

Heat-Sink Package

Transced

·

·

2G(kit of 2)

Transcend

TX1066QLU-2GK

SS

5

Heat-Sink Package

Transced

·

·

2G

Transcend

TX1066QLU-4GK

DS

5

Heat-Sink Package

Transced

·

·

1G

OCZ

OCZ2N10662GK

DS

N/A

Heat-Sink Package

OCZ

·

 

1G

GEIL

GB22GB8500C5DC

SS

5

GL2L128M88BA25AB

GEIL

·

·

1G

GEIL

GB24GB8500C5QC

SS

5

GL2L128M88BA25AB

GEIL

·

·

1G

GEIL

GE22GB1066C5DC

SS

5

Heat-Sink Package

GEIL

·

·

1G

GEIL

GE24GB1066C5QC

SS

5

Heat-Sink Package

GEIL

·

·

2G(kit of 2)

G.SKILL

F2-8500CL5D-2GBPK

DS

5-5-5-15

Heat-Sink Package

N/A

·

·

1G

G.SKILL

F2-8500CL5S-1GBPK

DS

5-5-5-15

Heat-Sink Package

G.SKILL

·

·

1-12

Chapter 1: Product introduction