After doing some GPU research I have determined that just about any GPU upgrade on the 8500 will also require a PSU upgrade to 600W. Even some of the upgraded cards that Dell sells require a 500W GPU in there specs (yet Dell sells them with the standard 460W PSU). There are a number of forum comments by those with upgraded GPUs but not upgraded PSUs incur various problems, particularly during game-play for extended periods. Something you may want to examine a bit closer.
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