I have two GPUs for my early 2008 mac pro (2x 3.2ghz Xeon, 16GB OWC Ram), the first is an EVGA GTX 285 flashed with the mac efi and the second is an Apple radeon 5770. The system runs OS X 10.11.6 just fine.
The strange thing is that in most games on OS X the 5770 outperforms the 285 by a signifigant amount.
For example: Life Is Strange at high settings can barely stay above 20FPS (avg 23) with the 285 but never drops below 30 (avg 45) with the 5770.
FireWatch at low settings runs at about 30FPS Avg on the 5770 but the GTX285 runs at about 10FPS for a few seconds and then OS X crashes.
Tomb Raider 2013 Runs perfectly fine on both cards with the GTX 285 outperforming the 5770 by a healthy margin IF you check the box that says "Use Legacy OpenGL" (this box doesn't have to be checked for it to work with the 5770). This led me to believe it was an API issue, so I fired up OpenGL Extensions Viewer only to discover that they both only support OpenGL 2.1 and the only differences I could find were the max texture size (5770=16384 vs 285), max uniform vertex components (5770=3072 vs 285=4096), max uniform fragment components (5770=3072 vs 285=2048), max geometry uniform components (5770=3072 vs 285=2048), and max varying floats (5770=128 vs 285=60). I tried running the built in Iron Fist Boxing Kings test using OpenGL 2.1 on both cards and the GTX285 managed 23FPS while the 5770 was at 154FPS!
Any application that uses the GPU for computing (i.e. FCPX) seems to run a fair bit slower with the GTX285, but I haven't actually measured this.
So maybe its the drivers? I tried installing the latest web drivers for the GTX285 and it made no difference with anything. It isn't the hardware itself because using bootcamp with Windows 10 the GTX 285 smokes the 5770 in every test I've ran.
My google-fu has been no help, so if anyone knows why it's like this or how to fix it I'd sure love to know.
Thank you in advance
The strange thing is that in most games on OS X the 5770 outperforms the 285 by a signifigant amount.
For example: Life Is Strange at high settings can barely stay above 20FPS (avg 23) with the 285 but never drops below 30 (avg 45) with the 5770.
FireWatch at low settings runs at about 30FPS Avg on the 5770 but the GTX285 runs at about 10FPS for a few seconds and then OS X crashes.
Tomb Raider 2013 Runs perfectly fine on both cards with the GTX 285 outperforming the 5770 by a healthy margin IF you check the box that says "Use Legacy OpenGL" (this box doesn't have to be checked for it to work with the 5770). This led me to believe it was an API issue, so I fired up OpenGL Extensions Viewer only to discover that they both only support OpenGL 2.1 and the only differences I could find were the max texture size (5770=16384 vs 285), max uniform vertex components (5770=3072 vs 285=4096), max uniform fragment components (5770=3072 vs 285=2048), max geometry uniform components (5770=3072 vs 285=2048), and max varying floats (5770=128 vs 285=60). I tried running the built in Iron Fist Boxing Kings test using OpenGL 2.1 on both cards and the GTX285 managed 23FPS while the 5770 was at 154FPS!
Any application that uses the GPU for computing (i.e. FCPX) seems to run a fair bit slower with the GTX285, but I haven't actually measured this.
So maybe its the drivers? I tried installing the latest web drivers for the GTX285 and it made no difference with anything. It isn't the hardware itself because using bootcamp with Windows 10 the GTX 285 smokes the 5770 in every test I've ran.
My google-fu has been no help, so if anyone knows why it's like this or how to fix it I'd sure love to know.
Thank you in advance
