I'd have to say OWC unless you can find a flashed one.Where is the best place to buy a 3870 for a Mac Pro these days?
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You're not going to need 3870s in Crossfire for that...What kind of performance could you expect out of 2x 3870's in Windows? I just got my 8-core 2.8 (only 2 gigs ram though for now), but just have the stock video. I've got games ranging from old school (Jedi Knight 2) to Age of Empires 3, FEAR, Far Cry, etc. I am not necessarily worried about running MAX settings at an ultra high resolution, but I my stock card will likely choke bigtime on some of these games.