Asus M4A78-EM 1394 Specifications Page 24
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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
- Motherboard 1
- February 2009 2
- First Edition V1 2
- Contents 3
- Safety information 7
- About this guide 7
- Where to nd more information 8
- Typography 8
- (continued on the next page) 10
- Chapter 1 13
- ASUS M4A78-EM 1-3 15
- 1.4 Before you proceed 17
- 1.5 Motherboard overview 18
- 1.5.3 Motherboard layout 19
- 1.5.4 Layout contents 19
- 1.6.1 Installing the CPU 20
- ASUS M4A78-EM 1-9 21
- CPU Heatsink 22
- Retention bracket 22
- Retention bracket lock 22
- Retention Module Base 22
- Channel Sockets 23
- Channel A DIMM_A1 and DIMM_A2 23
- Channel B DIMM_B1 and DIMM_B2 23
- 1.7.2 Memory congurations 24
- DDR2-800MHz capability 25
- DDR2-667MHz capability 27
- 1.7.3 Installing a DIMM 28
- 1.7.4 Removing a DIMM 28
- 1.8 Expansion slots 29
- 1.9 Jumpers 30
- 1.10 Connectors 31
- 1.10.2 Internal connectors 33
- ASUS M4A78-EM 1-25 37
- 1.11 Software support 41
- Chapter 2 43
- Updating from the Internet 44
- Updating from a BIOS file 44
- 45
- Recovering the BIOS 46
- 2.2 BIOS setup program 47
- 2.2.1 BIOS menu screen 48
- 2.2.2 Menu bar 48
- 2.2.3 Navigation keys 48
- Pop-up window 49
- Scroll bar 49
- 2.3 Main menu 50
- 2.3.4 SATA Conguration 51
- 2.3.5 System Information 51
- 2.4 Advanced menu 52
- 2.4.2 CPU Conguration 53
- 2.4.3 Chipset 54
- Parallel Port IRQ [IRQ7] 55
- 2.4.6 USB Conguration 56
- 2.4.5 PCIPnP 56
- 2.5 Power menu 57
- 2.6 Boot menu 59
- 2.6.3 Security 60
- Change User Password 61
- Clear User Password 61
- Password Check [Setup] 61
- 2.7 Tools menu 62
- 2.8 Exit menu 63
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