Mac Pro only showing 3gb instead of 4gb of memory

I have noticed that my mac is running more slowly since installing an update of Leopord. Then when I installed Lion with a clean boot and drive that the Mac is still running very slowly. I found that I have only 3 GB 800 MHz DDR2 FB-DIMM instead of 4 GB. It appears that one of the Ram has gone bad!
What happen to one of my memory sticks and if I want to increase my memory to either 8 GB or 16 GB, what kind would work best with my Mac?
Processor 2 x 2.8 GHz Quad-Core Intel Xeon
Memory 3 GB 800 MHz DDR2 FB-DIMM
Software Mac OS X Lion 10.7.2 (11C74)
Thanks,
Gary

Ok, for a 2008 here's the dimm slot layout:
Note tht the picture you show earlier for you slot layout agrees and illustrates this diagram for 4 dimms. Two identical dimms in slots 1 and 2 of riser 1 and similarly for riser 2. Your picture also shows what looks like a clickable button to show you how to upgrade the memory ("Memory Upgrade Instructions"). I assume that will take you to some illustration similar to what I posted.
Look at the OWC page for a 2008 mac pro (click link). Knowing how these are to be placed in the slots, and knowing you can use 1GB, 2GB, or 4GB dimms, and considering their prices, and how much total memory you want, and whether you want to add to or replace your existing dimms to get to that total, is a budget and math problem only you can solve.

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Mac Pro only showing 3gb instead of 4gb of memory

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