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<blockquote data-quote="pigoo3" data-source="post: 1820555" data-attributes="member: 56379">I think many times a Windows 5870 will work with a tower Mac Pro right out of the box.&nbsp; Maybe not 100% exactly like a genuine Apple/Mac 5870...but then this is always the risk when using a Windows video card (Windows video cards are always way way less expensive than the Apple version).With all of the modding that goes on in the Windows community...maybe the ROM on this particular card was setup (out of the box) to work with a specific Windows setup or OS...or maybe it was flashed with different ROM by the previous owner.I did a little searching...and there are guides out there with procedures how to flash a 5870 to work with a Mac.&nbsp; I would suggest searching &amp; find a procedure that you're comfortable with...and give it a shot.&nbsp; Flashing video cards can be tricky...be careful &amp; patient.Of course if you decide to give it a shot...please let us know how it went!<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />Thanks,- Nick</blockquote>

[QUOTE="pigoo3, post: 1820555, member: 56379"] I think many times a Windows 5870 will work with a tower Mac Pro right out of the box. Maybe not 100% exactly like a genuine Apple/Mac 5870...but then this is always the risk when using a Windows video card (Windows video cards are always way way less expensive than the Apple version). With all of the modding that goes on in the Windows community...maybe the ROM on this particular card was setup (out of the box) to work with a specific Windows setup or OS...or maybe it was flashed with different ROM by the previous owner. I did a little searching...and there are guides out there with procedures how to flash a 5870 to work with a Mac. I would suggest searching & find a procedure that you're comfortable with...and give it a shot. Flashing video cards can be tricky...be careful & patient. Of course if you decide to give it a shot...please let us know how it went!:) Thanks, - Nick [/QUOTE]

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