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[Guru3D]Sapphire Radeon RX 480 Nitro - Page 79

post #781 of 860
Quote:
Originally Posted by orlfman View Post

amd will probably never match the efficiency of nvidia for one reason, hardware scheduler.

ever since keplar, nvidia ditched the hardware scheduler for the sole purpose of reducing power consumption. it was one of the biggest reasons why keplar brought pretty deep power consumption cuts over fermi. maxwell further this by removing more scheduling off the gpu to software.

yes overall architecture matters a lot, but hardware schedulers do increase power consumption and thus heat. if nvidia kept using a hardware scheduler their tdp would be higher and probably closer to amd's.

huh. I had not heard of that actually. I know schedulers do take a good bit of power, but I would think a hardware scheduler would be way better than doing it in software. I wonder if that software scheduler is one of the big reasons Nvidia have so much higher DPC latency issues than AMD has. I seem to remember people started brining up that issue around the Kepler era and it has been going on ever since to varying degrees.

Though I have to wonder, why does AMD take a much larger hit when paired with a less power CPU compared to nvidia? I would think if Nvidia does scheduling in software and AMD has hardware units for it, that Nvidia would be the one taking a big hit when CPU performance goes down...
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post #782 of 860
The hardware scheduler is the reason why people saying AMD drivers suck under DX11 don't understand what's going on. Drivers would not fix the issue because the scheduler is made to work in a certain way, and DX11 is one of the worst ways to make use of it. Under DX12 and Vulkan the scheduler can be made to work like it should.
post #783 of 860
Quote:
Originally Posted by Klocek001 View Post

or..OR...if you see everything consume way more then it might be that this is system draw not gpu draw tongue.gif

System draw is way off.
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post #784 of 860
Quote:
Originally Posted by Krzych04650 View Post

Another review showing this Nitro needing some crazy 2300 RPM to stay below 80C. Just horrible. My Fury Nitro stays at 52C if I set such crazy high fan speed. I am getting 77C at 800 RPM. Sapphire just failed so bad with this 480.
RPM doesn't mean anything. 2300 RPM on my old HD5870 was barely more than a whisper.
post #785 of 860
Quote:
Originally Posted by fatmario View Post

Another review looks like the nitro throttles from its boost

he try everything Overclock was not stable.

I had high expectation from sappphire but this is disappointing.

Yeah, he 'tried everything' except he couldn't have tried Trixx, which isn't ready yet, and which is probably what will make this overclock. Like I said, WattMan seems buggy. Using ASUS' own OC software allowed one reviewer to hit 1400 on Strix whereas WattMan achieved a lot less.
post #786 of 860
Quote:
Originally Posted by AmericanLoco View Post

RPM doesn't mean anything. 2300 RPM on my old HD5870 was barely more than a whisper.

I means a lot especially for GPUs with almost identical fan design. Only difference here is 95mm vs 90mm, the rest looks the same, design is the same.

And also this is not possible to make 2300 RPM barely more than a whisper, especially for some old card with old fan design.
post #787 of 860
Quote:
Originally Posted by Shatun-Bear View Post

HEXUS review just in of the 480 Strix.

According to them, the 480 Strix draws 'only' 48W more than the 1060 Strix. Which is hardly the efficiency disaster some are trying to make out.



http://hexus.net/tech/reviews/graphics/94945-asus-rog-strix-radeon-rx-480-oc/?page=13
To make it simple in a 100-150W range having additional 50W power consumption is a big jump of 33%.
post #788 of 860
Quote:
Originally Posted by EniGma1987 View Post

huh. I had not heard of that actually. I know schedulers do take a good bit of power, but I would think a hardware scheduler would be way better than doing it in software. I wonder if that software scheduler is one of the big reasons Nvidia have so much higher DPC latency issues than AMD has. I seem to remember people started brining up that issue around the Kepler era and it has been going on ever since to varying degrees.

Though I have to wonder, why does AMD take a much larger hit when paired with a less power CPU compared to nvidia? I would think if Nvidia does scheduling in software and AMD has hardware units for it, that Nvidia would be the one taking a big hit when CPU performance goes down...

like the andetech article mentions, nvidia was able to get away with moving the hardware scheduler off of the gpu to software because the hardware scheduler wasn't being fully utilized. for dx11, dx10, dx9, extra, a hardware scheduler was overkill for what was offered at the time. they were not complex enough to benefit from all the power a hardware scheduler has to offer. dx11 and its predecessors where not parallel type api's like dx12 & vulkan are. things like asynchronous compute wasn't really possible with dx11 and below so you didn't need to worry about running multiple things in parallel or a whole a lot of different things singly at the same time. such as compute + graphics. things like that are very complex and need a hardware scheduler to get the most amount of performance. they also didn't think an api would ever come out that would provide more low level hardware access.

nvidia downplayed compute and didn't envision a future api to ever include such features. they really thought api's would continue like dx11 and they didn't think developers would want more access to the hardware.

normally the problem with a software scheduler is overhead, but since dual and quad cores have been the norm since 2007, nvidia was able to get around this by making their drivers multithreaded for dx11.

a software based scheduler was more than enough for dx11, and it also gave them the ability to modify the scheduler on the fly. unlike a hardware scheduler where once built you couldn't modify it. you could only work around it. if you wanted to release an updated version, you had to release a whole new card.

dx12 fixes the overhead issue for amd. their drivers for dx12 are multithreaded (have to be for dx12) so amd no longer faces higher overhead and nvidia no longer has this as an edge over amd. driver head between the two in dx12 are very similar. they're very low. but this time around amd does have an edge with hardware better suited for the parallel nature of dx12 & vulkan. with dx12 a hardware scheduler is better suited.
Edited by orlfman - 7/27/16 at 7:32pm
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post #789 of 860
Quote:
Originally Posted by ChevChelios View Post

Quote:
and Now you think Polaris with 14nm should be reached at Pascal Level?!
well, if the GCN/Polaris arch was more efficient then it could have at least come close

Quote:
this doesn't mean It can reach Pascal level
.. whic means they are pretty behind Nvidia in this aspect, not just in Polaris, but in everything

perhaps disaster was too strong a word tongue.gif

Well atleast they did not ask $700+ for single card stuttering. tongue.gif

Besides, did you receive marketing material for TitanXP. Seems your skills would be required any moment now.
post #790 of 860
Quote:
Well atleast they did not ask $700+ for single card stuttering.
mine doesnt stutter

checkmate tongue.gif
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