Mixing AMD GPUs.

[Solidww]

Hello, fellow hackintoshers. I am wondering if anyone has used multi AMD GPU that didn't match? What I am considering doing is using an R9-270X 2GB model with a 4GB model. Or possibly using a 7950 with the R9 series GPU since OS X sees the R9 card in the machine currently as a 7XXX card. FCPX, Motion 5 and other apps run so well with the R9 card and I feel that two cards would only provide more amazing performance.

I don't expect massive replies but anyone's opinion and experience is greatly appreciated. Thank you in advanced.

 

[rwillett]

Hello, fellow hackintoshers. I am wondering if anyone has used multi AMD GPU that didn't match? What I am considering doing is using an R9-270X 2GB model with a 4GB model. Or possibly using a 7950 with the R9 series GPU since OS X sees the R9 card in the machine currently as a 7XXX card. FCPX, Motion 5 and other apps run so well with the R9 card and I feel that two cards would only provide more amazing performance.

I don't expect massive replies but anyone's opinion and experience is greatly appreciated. Thank you in advanced.

I have only used graphics cards that didn't match, a 280X and an Intel 4600 (or something). FCP X performance was rubbish as it preferred to use the internal Intel Graphics card. Disabling the internal card moved the performance back up.

I now have dual R280X cards and everything works very well indeed. I do the BruceX benchmark in 23 seconds. Dual 270x cards will help. You *may* (or may not) get a performance improvement with a 270X and for example a 280X. My view is that it will probably help but thats a wild guess based on zero facts as nobody has ever confirmed it and I have asked the question before.

Rob

 

[Solidww]

I have only used graphics cards that didn't match, a 280X and an Intel 4600 (or something). FCP X performance was rubbish as it preferred to use the internal Intel Graphics card. Disabling the internal card moved the performance back up.

I now have dual R280X cards and everything works very well indeed. I do the BruceX benchmark in 23 seconds. Dual 270x cards will help. You *may* (or may not) get a performance improvement with a 270X and for example a 280X. My view is that it will probably help but thats a wild guess based on zero facts as nobody has ever confirmed it and I have asked the question before.

Rob

Hey, Rob. Thank you for your response. I had that same problem with Intel HD and a GTX card. Absolute rubbish! I am going to test some cards today and see what kind of results I get. Stay tuned as I report back.

 

[Solidww]

Okay, the findings are quite perplexing. I ran the BruceX 5k test several times and took the average to reduce minor errors.

R9-270X = 34 seconds.
R9-270X + 7950 = 34 seconds.
R9-270X + 6450/5450 = 34 seconds.
R9-279X + GTX760 = 34 seconds.

Either a) The SSD/HDD combo is holding up the rendering or b) Two exact cards are needed for faster rendering.

I will add that with R9-270X + 7950 or GTX760 combo the playback of 4k QT files was seamless with any effects I put on the clip. With the R9-270X alone or 6450/5450 combo playback of the same file would hang or just simply not play.

Hope anyone looking for this kind of info get something out of this post.

 

[pano_78]

Did you investigate any further? I´m considering adding a 7950 to my 280x setup for fcpx. Will it do any good? I haven't found any good info about it.