Mac Pro seems to be missing 0.5 GB of ram after Snow Leopard install

I just installed Snow Leopard on my Mac Pro (2 x 2.8 GHz Quad-Core Intel Xeon). The computer has only ever had the default 2 GB of RAM that comes with it from Apple. I know I need more, it's on order. The odd thing that I noticed after installing Snow Leopard is that the computer now only reports 1.5 GB or RAM in the "About This Mac" box. Specifically it says: "1.5 GB 800 MHz DDR2 FB-DIMM". Odd.
Second if I click "More Info..." below is what I see in the memory slots.
Does anyone know what might have caused this, or if its possible to get that 0.5 GB back?
Second I just ordered 8 GB of RAM (MACMEM 4Gx2|KST KTA-MP800K2/8G R). If the above issue doesn't get resolved what do you suggest I do when the new RAM arrives? Should I just add in the new stuff for a total of 9.5 GB, or should I also take out the existing RAM that's reporting odd values? I'm wondering if the missing 0.5 GB is a symptom of other issues, and maybe that RAM is "sick" and could slow things down somehow.
Thanks for any ideas.
Jesse
Memory Slots:
ECC: Enabled
DIMM Riser B/DIMM 1:
Size: 1 GB
Type: DDR2 FB-DIMM
Speed: 800 MHz
Status: OK
Manufacturer: 0x802C
Part Number: 0x3138484631323837324A4438304544364434
Serial Number: 0xD834438C
DIMM Riser B/DIMM 2:
Size: Empty
Type: Empty
Speed: Empty
Status: Empty
Manufacturer: Empty
Part Number: Empty
Serial Number: Empty
DIMM Riser A/DIMM 1:
Size: 512 MB
Type: DDR2 FB-DIMM
Speed: 800 MHz
Status: OK
Manufacturer: 0x802C
Part Number: 0x3138484631323837324A4438304544364434
Serial Number: 0xD8344473
DIMM Riser A/DIMM 2:
Size: Empty
Type: Empty
Speed: Empty
Status: Empty
Manufacturer: Empty
Part Number: Empty
Serial Number: Empty
DIMM Riser B/DIMM 3:
Size: Empty
Type: Empty
Speed: Empty
Status: Empty
Manufacturer: Empty
Part Number: Empty
Serial Number: Empty
DIMM Riser B/DIMM 4:
Size: Empty
Type: Empty
Speed: Empty
Status: Empty
Manufacturer: Empty
Part Number: Empty
Serial Number: Empty
DIMM Riser A/DIMM 3:
Size: Empty
Type: Empty
Speed: Empty
Status: Empty
Manufacturer: Empty
Part Number: Empty
Serial Number: Empty
DIMM Riser A/DIMM 4:
Size: Empty
Type: Empty
Speed: Empty
Status: Empty
Manufacturer: Empty
Part Number: Empty
Serial Number: Empty

I am running a '07 Mac Pro that has had 7GB RAM since I bought it almost 3 years ago - the original 2x512MB + 6x1GB purchased from Crucial.com. Suddenly, after installing Snow Leopard, only 6GB are being recognized; two of the 1GB DIMM's now read as 512MB in System Profiler, and the Part Number and Serial Number listed for those modules are incorrect.
After searching these forums for ideas, I have tried:
• Resetting the PRAM -- no change
• Running Apple Hardware Test -- no problems found
• Running TechTool Deluxe 3.1.3 (updated for Snow Leopard) -- no problems found
• Running TechTool Pro 5.1.6 (updated for Snow Leopard) -- no problems found
• Running system scanner (beta) from Crucial.com - cannot read installed RAM
The only thing I haven't tried is physically reinstalling the modules, but since the computer hasn't moved in months that seems pretty doubtful. If I make any progress I'll post again, otherwise, I'll be contacting Crucial for replacements.

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