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That's a plastic cooling duct, and it's removable without disturbing the heatsink. Dell uses a big passive heatsink with a duct to a case-mounted fan for cooling. In the top pic, top left, under the blue SATA data cable, see that tab? I think all you have to do is depress it (and possibly another one not visible in the pic) and it will slide or lift off.
Get us a clear closeup of the label on that existing PSU, please. Dell tends to underrate their PSU's, and that one may well have enough guts to run a 660 by itself - which is what I'd do anyway. Does that motherboard even have a second PCI-Ex16 slot? What exact CPU does this rig have?
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