Asus P5Q SE2 User Manual - Page 22

Memory configurations

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1.7.2 Memory configurations You may install 512MB, 1GB, 2GB, and 4GB unbuffered non‑ECC DDR2 DIMMs into the DIMM sockets. Recommended Memory Configurations Mode Single-Channel Dual-channel (1) Dual-channel (2) DIMM_A1 Populated Populated Populated Sockets DIMM_A2 DIMM_B1 - Populated - - - Populated Populated Populated DIMM_B2 Populated • When using only one DDR2 DIMM, start installing it from DIMM_A1 or DIMM_B1 for better overclocking capability. • For dual-channel configuration (1), install two identical DIMMs in DIMM_A1 and DIMM_B1. • For dual-channel configuration (2), you can: - install four identical DIMMs in all four slots; or - install one identical DIMM pair in DIMM_A1 and DIMM_B1 (yellow slots) and another identical DIMM pair in DIMM_A2 and DIMM_B2 (black slots). • Always install DIMMs with the same CAS latency. For optimum compatibility, it is recommended that you obtain memory modules from the same vendor. • When you install a total memory of 4GB or more, Windows® 32-bit operating system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended if you are using a Windows 32-bit operating system. • This motherboard does not support memory modules made up of 128Mb chips. • This motherboard supports up to 16GB on a Windows® XP Professional x64 and Windows® Vista x64 Edition. You may install a maximum of 4GB DIMM on each slot. • The default memory operation frequency is dependent on its SPD. 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, see section 2.4 Ai Tweaker menu for manual memory frequency adjustment. • The memory modules may require a better cooling system to work stably under full loading (4 DIMMs) or overclocking setting. • Some old-version DDR2-800 DIMMs may not match Intel®'s On‑Die‑Termination (ODT) requirement and will automatically downgrade to run at DDR2-667. If this happens, contact your memory vendor to check the ODT value. • Due to chipset limitation, DDR2-800 with CL=4 will be downgraded to run at DDR2-667 by default setting. If you want to operate with lower latency, adjust the memory timing manually. 1-12 Chapter 1: Product introduction

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1-12
Chapter 1: Product introduction
1.7.2
Memory configurations
You may install 512MB, 1GB, 2GB, and 4GB unbuffered non-ECC DDR2 DIMMs into the
DIMM sockets.
Recommended Memory Configurations
Mode
Sockets
DIMM_A1
DIMM_A2
DIMM_B1
DIMM_B2
Single-Channel
-
-
Populated
-
Populated
-
-
-
Dual-channel (1)
Populated
-
Populated
-
Dual-channel (2)
Populated
Populated
Populated
Populated
•
When using only one DDR2 DIMM, start installing it from DIMM_A1 or DIMM_B1 for
better overclocking capability.
•
For dual-channel configuration (1), install two identical DIMMs in DIMM_A1 and
DIMM_B1.
•
For dual-channel configuration (2), you can:
-
install four identical DIMMs in all four slots; or
-
install one identical DIMM pair in DIMM_A1 and DIMM_B1 (yellow slots) and
another identical DIMM pair in DIMM_A2 and DIMM_B2 (black slots).
•
Always install DIMMs with the same CAS latency. For optimum compatibility, it is
recommended that you obtain memory modules from the same vendor.
•
When you install a total memory of 4GB or more, Windows
®
32-bit operating system
may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is
recommended if you are using a Windows 32-bit operating system.
•
This motherboard does not support memory modules made up of 128Mb chips.
•
This motherboard supports up to 16GB on a Windows
®
XP Professional x64 and
Windows
®
Vista x64 Edition. You may install a maximum of 4GB DIMM on each slot.
•
The default memory operation frequency is dependent on its SPD. 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, see
section
2.4 Ai Tweaker menu
for manual memory frequency adjustment.
•
The memory modules may require a better cooling system to work stably under full
loading (4 DIMMs) or overclocking setting.
•
Some old-version DDR2-800 DIMMs may not match Intel
®
’s On-Die-Termination (ODT)
requirement and will automatically downgrade to run at DDR2-667. If this happens,
contact your memory vendor to check the ODT value.
•
Due to chipset limitation, DDR2-800 with CL=4 will be downgraded to run at DDR2-667
by default setting. If you want to operate with lower latency, adjust the memory timing
manually.