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.