2x512 Ram showing up as 1x512 to BIOS and Windows

[agent4573]

I have an ASUS A8N-SLI Deluxe I just installed and am having some memory issues. My bios version is 1805, which is the latest version available from the asus website. BIOS splash screen shows 1gig of ddr400 dual channel 128bit ram installed. Memory installed is Patriot PDC1G3200LLK, dual channel 2x512, CL 2-3-2-5. I have 2 gigs installed in Dimm slot A1 and B1, which is what the motherboard manual says to use for 2 sticks. Each 1 gig stick is coming up as 512 megs.

BIOS settings are as follows:
Timing Mode:Auto
Memlock Index Value:400Mhz
Cas# latency (Tcl): 2.5
Min Ras# active timing:(Tras): 5T
RAS# to CAS# delay (Trcd): 4T
Row precharge time (Trp): 4T
Row cycle time (Trc): 11T
Row refresh cyc time (Trfc): 13T
Read to write time (Trwt): 4T
Write recovery time (Twr): 3T
1T/2T memory timing: 2T
S/W DRAM over 4G remapping: I've tried both enabled and disable w/ no difference

Windows recognizes the following:



So what do I do next? and thanks in advance!

[agent4573]

I adjusted the timing setting in BIOS to match those on the ram chip and it still reads the same.

[Apoptosis]

Could be a bad module, not seated properly, bad slot... have you reseated the modules?

Pull one module out at a time and see if the system works with each as a 512MB module. If it does then you know it's board related.