Some months ago now ( iam slow in fixing stuff ;P) my 8800 gt for my mac pro 2008 died and i need to buy a new card. Mac wants me to buy the 5870 for abour 4500 sek (650ish dollars) or the 5770 for about half the price. None of these cards is what i want. So i read this: http://www.groths.org/?p=297 and some other posts (including some from this forum) that said that it will work w/o flashing (Making the title of this post misleading), only with special installed drivers. These cards are about 1700 sek so I can take the graphics card from my dads old, old mac pro and put it in mine install the driver, then put in the 6870. Would getting 2 of these work ? (crossfiring) and would i get increased performance ? I only really care about my W7 partition, the Mac partition is less important, i only need one card to work there. *edit* I just read something about steam crashing ? Is this true ?