A8N32-SLI Deluxe will not POST with 4x1GB installed

[Nocturnal]

Is there a reason that this occurs? I can have 3x1GB but not all 4 dimm slots populated. Any ideas? I am running latest BIOS, 1405.

I was trying to run all four DIMMs at 1t. Reset CMOS and all is well. Even though Windows only sees 3.0GB of it

 

[Quiksilver]

4 Dimm's should be run at 2T.
Also IIRC AMD acts a bit flaky with 4 dimms anyway