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In the manual, it lists an AMD W7000 card under the slot priority list (page 99).  Then on page 100, it says ONLY supports Q4000 and Q6000.  Then on page 175, under Expanded Operating Temperature Restrictions, it says no GPU support.

I wanted to see what the final word is of GPU supports.  Usually in this situation, Dell has verified some cards will work, but officially, it is not supported.