Xp pro 64 bit still only 2.99 gb out of 5gb

Hello,
I have a "dell optiplex 745 small form" with a pen d 3.40ghz. operating system is Windows XP Professional 64-bit Corporate Edition. My ram is ULT31908 2048mb pc2-6400 800mhz ddr2 but it only shows as 1gb in bios and in systems info. I've updated the bios to 2.6.4 the latest they have at dell. Im stumped....... any help would be great.
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More about tomshardware
  1. ULT31908 is a kit of 2 x 1GB modules. How many modules are installed? Is memory remapping enabled?
  2. Most likely a BIOS or motherboard limitation.
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