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After this seeing this thread... I cracked open an Apogee I had picked up locally as a favor for a friend and looking closely.............sure as s**t there are metal shavings on some parts of the base, more towards the outer pins. After holding this block in my hands, I'm glad it's not mine and...
The PolarFlo held on ok, at least the two bolts are wide apart as opposed to the distance the Radeon holes are (very close to the block itself...not much leverage). I was a lot sketchier about mounting a gpu block with two bolts on a Radeon moreso than my 6800Ultra, so you should be ok.
Yes I can attest that it'll fit, however, something to keep in mind. The Swifty has more clearance for memory sinks of all sizes. The PolarFlo is limited on possible heatsinks that it could be used with.