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1.7.2 Memory congurations
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 conguration. 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 Qualied Vendors Lists (QVL)
DDR2-1066MHz capability
Size Vendor Part No.
SS/
DS
CL Chip No.
Chip
Brand
DIMM
support
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 · ·
Chapter 1: Product introduction1-12