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Post by Mat HD on Feb 10, 2018 19:09:23 GMT
graphics cards are capable of dealing with those kinds of heat. but obviously lower is better for overall longevity. I've had my machine for nearly four years now and it's been fine the whole time, thats even after lots of lots of testing faulty drivers on it when I first started this website. You will be fine don't worry.
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Post by mike on Feb 10, 2018 19:20:12 GMT
I get up to 97 degrees after playing Witcher 3 for some minutes - I dont think this is healthy... monitored with AIDA64. 16gb version Use Mac Fan Control, and set a higher basic fan speed. That’s what I’ve done with my late 2012 iMac, and there is a beta available now that supports iMac Pro.
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bollusc
Junior Boot Camper
Posts: 11
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Post by bollusc on Feb 10, 2018 20:09:43 GMT
but guys, seriously: In one Mac test they monitored the iMac Pro during Unigine Valley and it did not go above 75 degrees. Playing with almost 100 doesnt seem fine to me. Todays AMD chips also dont have the same temp specs as Nvidia chips 5 years ago... I just cant information on that vega 64 one though
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Post by mike on Feb 10, 2018 21:08:33 GMT
but guys, seriously: In one Mac test they monitored the iMac Pro during Unigine Valley and it did not go above 75 degrees. Playing with almost 100 doesnt seem fine to me. Todays AMD chips also dont have the same temp specs as Nvidia chips 5 years ago... I just cant information on that vega 64 one though But the HBM2-memory will throttle if the temperature gets too high, ie. over 80 C afaik. Over prolonged gaming sessions with default fan profile, the GPU pushes 95 C or more (see tests on youtube). The Vega GPU is limited by memory bandwidth, and performance is heavily memory-dependent. After all, the biggest reason Vega became somewhat of a disappointment, was that AMD didn't get the high-specced HBM2 they were promised, and ended up "overclocking" slower-running memory (but getting a power-hungry graphics card). I'm still waiting for my iMac Pro w/Vega64, so I can't test this yet. However, I will definately use Mac Fan Control. By turning up the fans a little, one could possible use some overclocking/undervolting too, when/if necessary. That depends on the Vega Pro 56/64 of course, which could be heating up very quickly (if acting similar to the desktop version). I've overclocked my Nvidia 680MX with great performance improvement, and has been 100% stable for 5 years now. I do watch the temperatures though. Also, big changes in temps causes wear on the electronics, and with Mac Fan Control the temps are more stable. Gaming pushes the temperature like hardly nothing else, since both the CPU and GPU are working hard. Better to err on the safe side IMO.
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bollusc
Junior Boot Camper
Posts: 11
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Post by bollusc on Feb 10, 2018 21:13:02 GMT
Compared Win and Mac Version of Unigine Heaven:
Score: Win 2600; Mac 1719
Temperatures were roughly the same and even the Mac OS did not throttle it but the overall driver performance seemed to be better under win with your drivers.
If Mac OS also accepts the 90+ degrees I assume it will be fine...
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bollusc
Junior Boot Camper
Posts: 11
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Post by bollusc on Feb 10, 2018 22:42:51 GMT
so when looking at the fps of Witcher 3, it looks to me as if the vega is running more like a 580 - gpu-z tells me that its about 1340 mhz, so is this already the max i can get out of it or is it "limited" to 580 level? I thought it would be more like a 1080/ti...
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Post by Mat HD on Feb 10, 2018 23:11:07 GMT
so when looking at the fps of Witcher 3, it looks to me as if the vega is running more like a 580 - gpu-z tells me that its about 1340 mhz, so is this already the max i can get out of it or is it "limited" to 580 level? I thought it would be more like a 1080/ti... Performance of the Vega 64 has been found to be comparable to a GTX 1080. Vega 56 closer to GTX 1070.
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bollusc
Junior Boot Camper
Posts: 11
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Post by bollusc on Feb 10, 2018 23:16:59 GMT
so when looking at the fps of Witcher 3, it looks to me as if the vega is running more like a 580 - gpu-z tells me that its about 1340 mhz, so is this already the max i can get out of it or is it "limited" to 580 level? I thought it would be more like a 1080/ti... Performance of the Vega 64 has been found to be comparable to a GTX 1080. Vega 56 closer to GTX 1070. Source? To me it looks a lot slower - with a 1080 you could run W3 in 1440p maxed out at 60-80 fps whereas with the Vega 64 you get about 40fps
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Post by Mat HD on Feb 10, 2018 23:49:51 GMT
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Post by mike on Feb 11, 2018 0:35:34 GMT
Don't forget Apple's Vega Pro version is downclocked. However, could be that bootcampdrivers are still unoptimised, The current Bootcampdriver for Vega Pro is after all using the Radeon 580 driver to work.
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bollusc
Junior Boot Camper
Posts: 11
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Post by bollusc on Feb 11, 2018 2:54:42 GMT
on the paper that might be nice, but without drivers making use of it, it's useless The normal bootcamp drivers would not have let me play W3 - EVERYTHING was unplayably stuttering... Really a pity
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Post by Mat HD on Feb 11, 2018 9:07:28 GMT
This workaround makes much better use of the Vegas potential. It probably doesn’t have a lot more to give.
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bollusc
Junior Boot Camper
Posts: 11
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Post by bollusc on Feb 11, 2018 9:10:15 GMT
I appreciate your work, thanks a lot!
However if THIS is the huge leap in performance (yes, I know, workstation....but compared to the commercials about the gpu power it's nowhere near), I really have to think about if it's worth it...
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bollusc
Junior Boot Camper
Posts: 11
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Post by bollusc on Feb 11, 2018 10:58:21 GMT
Ok, have tested TimeSpy benchmark (default settings):
Graphiocsscore: 6138
That would put the GPU (Vega 64) on par with a GTX 1070, maybe a bit above; but not really close to GTX 1080...
At least a little something
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Post by Mat HD on Feb 11, 2018 11:12:23 GMT
considering the design thinness of the iMac, the fact that its now possible to have that kind of gpu power put in there is incredible. Perhaps overclocking could be a thing soon on these cards to bring it that little bit closer to a 1080.
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