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The SG03 and SG04 will take it if you remove the fan from the front grill. You can either leave it as a space, or I believe it's possible to get a thin 120mm fan in there with the HD5870.
I would have thought the 5870 itself would be fine, the question mark would be over the CPU cooling.
Would an H5O fit over the upper 120mm fan?
Akromatic has a worklog of his SG03 with dual 5870 set up. Might want to look at his thread and see what exactly he did.
http://www.hardforum.com/showthread.php?t=1479300
I agree the SG03 really could use a rear exhaust fan.