Infinity NF4 SLI User Manual page 6

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Quick Setup Guide
Important Notes on Memory Usage
1. The system board will fail to boot when 3 DIMMs are used.
The integrated memory controller in AMD's 64-bit Socket 939
series CPU supports dual channel however when 3 DIMMs are
installed, the controller is not capable of accurately distinguishing
between dual and single channels resulting to boot up problem.
Even if you have luckily booted the system, the total memory
size detected is from 2 DIMMs only, not 3. Therefore we do not
suggest using 3 DIMMs.
2. The table below lists different memory configurations and their
corresponding memory speed. Take note that some memory
configurations will automatically reduce the memory speed to
DDR333.
If in any case the system becomes unstable, set the memory
timing from "1T" to "2T" in the "1T/2T Memory Timing" field
(Genie BIOS Setting submenu of the Award BIOS).
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Memory Speed DIMM 1
DDR400
DDR400
DDR400
DDR400
DDR400
DDR333
DDR400
DDR400
DDR400
DDR333
"S": Single side DIMM
"D": Double side DIMM
DIMM 2 DIMM 3
S
D
S
D
S S
D D
S S
D D
DIMM 4
S
D
S
D
S S
D D