AMD 580 Pro and RX 580

[Itzamna]

Hello.

So, are those 2 cards the same? Or is one of them under/overclocked? If they are the same, why two names? It's confusing!

Thank you.

 

[Ken1222]

The website below does some comparisons of the two...

http://gpuboss.com/gpus/Radeon-RX-580-vs-Radeon-Pro-580

 

[jerwin]

http://barefeats.com/imac17egpu.html

oddly enough, the RX580 is ten percent faster. could be an artifact of the testing procedures.

 

[J.Gallardo]

It’s quite difficult to find info about 580 Pro, even from AMD web.
I believe you can’t find AMD 580 Pro mounted on any system but last iMac. It’s a slightly underpowered/underclocked version of RX580... Biggest difference is 580Pro begs for 150W. , as RX580 needs 185W. Some webs state clock speed as being the same in both, wich I think difficult to believe. It’s no strange benchmarks should show a small advantage in hotter RX580.
More info would be appreciated...

 

[jerwin]

tech powerup: https://www.techpowerup.com/gpudb/2968/radeon-pro-580

Floating-point performance: 6,175 GFLOPS
Bandwidth: 256.0 GB/s

similar results are shown for https://www.techpowerup.com/gpudb/2938/radeon-rx-580

amd marketing materials:http://creators.radeon.com/radeon-pro/

5.5
TFLOPS
PEAK PERFORMANCE
36
(2304)
COMPUTE UNITS (STREAM PROCESSORS)
217
GB/S
MEMORY BANDWIDTH

peak performance on a graphics card is usually computed as

At a basic level, a 'flop' is a floating point operation - a basic unit of computational power. When applied to the AMD graphics technology at the heart of the Microsoft and Sony consoles, the calculation is really simple. You multiply the amount of shader cores in the GPU by its clock-speed. With AMD hardware, you'll find 64 shaders per compute unit. Xbox One has 12 CUs, PS4 has 18, giving us a total of 768 and 1152 shaders. The clock-speeds of the two consoles are 853MHz and 800MHz respectively.

It's pretty basic maths then, but after that, you multiply the result by two - and that's because for each clock, two different types of instruction (one multiply, one accumulate operation) are run simultaneously. This produces some insanely large numbers, so similar to the way the vast amount of storage in a typical hard drive is rationalised down into a digestible figure, the same thing happens with flops. So our final figure is divided by one million, giving us the final teraflop figure

http://www.eurogamer.net/articles/digitalfoundry-2016-what-the-hell-is-a-teraflop-anyway
so, figure
for the rx 580
6175/(2304*2)=1.34 GHz clock

for the radeon pro 580
5500/(2304*2)=1.19 GHz clock

The memory bandwidth reduction is also consistent with an underclocking.

 

[J.Gallardo]

tech powerup: https://www.techpowerup.com/gpudb/2968/radeon-pro-580



similar results are shown for https://www.techpowerup.com/gpudb/2938/radeon-rx-580

amd marketing materials:http://creators.radeon.com/radeon-pro/



peak performance on a graphics card is usually computed as


http://www.eurogamer.net/articles/digitalfoundry-2016-what-the-hell-is-a-teraflop-anyway
so, figure
for the rx 580
6175/(2304*2)=1.34 GHz clock

for the radeon pro 580
5500/(2304*2)=1.19 GHz clock

The memory bandwidth reduction is also consistent with an underclocking.

Thanks for the links...
(This confirmed what I think... but the “official” specs keep being confusing. https://www.techpowerup.com/gpudb/2968/radeon-pro-580 <— They also claim 1257-1340Mhz and put RX580 & 580Pro at same relative performance. Of course, AMD teraflops measure gives some clue. Last link is an interesting reading; still on it).
[doublepost=1512931159][/doublepost]... by the way... It’s incredible how similar 580 Pro and RX480 are!!:
http://www.trustedreviews.com/reviews/amd-radeon-rx-480

 

[Itzamna]

So, the 580 Pro is a under clocked RX 580... The 100Mhz were so problematic that they had to shave it off?

And why call it Pro if its worse when compared to the similar named graphics card?

 

[J.Gallardo]

“And why call it Pro if its worse when compared to the similar named graphics card?”
...Well... it’s Pro at spending less power... I guess it’s Pro-echologist or something...
Perhaps they thought 580Pro is nicer than 580Low, 580Light, or RX 480. Who knows...
The other day, I read about AMD “rebranding” old RX460 as RX560 or something similar...:
http://www.tomshardware.co.uk/amd-rx-560-specification-change,news-57461.html

 

[jerwin]

So, the 580 Pro is a under clocked RX 580... The 100Mhz were so problematic that they had to shave it off?

Why don't you underclock and overclock your RX580, and make a plot of Clock speed vs power consumption while running furmark.

 

[Itzamna]

Why don't you underclock and overclock your RX580, and make a plot of Clock speed vs power consumption while running furmark.

Because I don't have a RX 580... And because I don't manufacture and sell computers... And because that has nothing to do with the point?

 

[jerwin]

Here you are! Radeon 480 underclocked to draw 40 W, and make minimal noise.

going from 1338 MHz to 1100 dropped the temperature from 77 to 68 C, and cut the power consumption from 105 W to just 70 W.
80 percent of the performance; 66 percent of the power draw.

The imac is inhospitable compared to a blower fan.

 

[Georgio]

They should have kept with NVidia GPU's and be done with it....