Asus CROSSHAIR Crosshair English Edition User's Manual - Page 38

System memory

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2.4 System memory 2.4.1 Overview The motherboard comes with four Double Data Rate 2 (DDR2) Dual Inline Memory Modules (DIMM) sockets. A DDR2 module has the same physical dimensions as a DDR DIMM but has a 240-pin footprint compared to the 184-pin DDR DIMM. DDR2 DIMMs are notched differently to prevent installation on a DDR DIMM socket. The figure illustrates the location of the DDR2 DIMM sockets: DIMM_B1 DIMM_B2 DIMM_A1 DIMM_A2 128 Pins 112 Pins CROSSHAIR CROSSHAIR 240-pin DDR DIMM Sockets Channel Channel A Channel B Sockets DIMM_A1 and DIMM_A2 DIMM_B1 and DIMM_B2 2.4.2 Memory configurations You may install 256 MB, 512 MB, 1 GB, and 2 GB unbuffered ECC/non-ECC DDR2 DIMMs into the DIMM sockets. • If you installed Windows® XP 32-bit version operating system, we recommend that you install less than 3 GB of total memory. For Windows® XP 64-bit version operating system, the maxium support is 8 GB of total memory. • For dual-channel configuration, the total size of memory module(s) installed per channel must be the same (DIMM_A1 + DIMM_A2 = DIMM_B1 + DIMM_B2). • Always install DIMMs with the same CAS latency. For optimum compatibility, we recommend that you obtain memory modules from the same vendor. Refer to the DDR2 Qualified Vendors List on the next page for details. 2-12 Chapter 2: Hardware information

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2-±2
Chapter 2: Hardware information
2.4
System memory
2.4.1
Overview
The motherboard comes with four Double Data Rate 2 (DDR2) Dual Inline Memory
Modules (DIMM) sockets.
A DDR2 module has the same physical dimensions as a DDR DIMM but has a
240-pin footprint compared to the 184-pin DDR DIMM. DDR2 DIMMs are notched
differently to prevent installation on a DDR DIMM socket.
The figure illustrates the location of the DDR2 DIMM sockets:
Channel
Sockets
Channel A
DIMM_A1 and DIMM_A2
Channel B
DIMM_B1 and DIMM_B2
CROSSHAIR
CROSSHAIR 240-pin DDR DIMM Sockets
112 Pins
128 Pins
2
A
_
M
M
I
D
1
A
_
M
M
I
D
1
B
_
M
M
I
D
2
B
_
M
M
I
D
2.4.2
Memory configurations
You may install 256 MB, 512 MB, 1 GB, and 2 GB unbuffered ECC/non-ECC
DDR2 DIMMs into the DIMM sockets.
•
If you installed Windows
®
XP 32-bit version operating system, we
recommend that you install less than 3 GB of total memory. For Windows
®
XP 64-bit version operating system, the maxium support is 8 GB of total
memory.
•
For dual-channel configuration, the total size of memory module(s) installed
per channel must be the same (DIMM_A1 + DIMM_A2 = DIMM_B1 +
DIMM_B2).
•
Always install DIMMs with the same CAS latency. For optimum
compatibility, we recommend that you obtain memory modules from the
same vendor. Refer to the DDR2 Qualified Vendors List on the next page
for details.