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[VideoCardz] Rumour: AMD Radeon RX 480 specifications leaked - Page 34

post #331 of 383
Quote:
Originally Posted by variant View Post

The dual 480 got 62.5. fps with these specifications. A dual 390X with the same settings and similar specifications got 58.9 fps. A different game version, but there isn't a significant change from 1.0.18769 to 1.12.19928 for the 390X.

Another dual 480 got 66 fps at Extreme 1440p while another dual 390X got 66.6 fps with similar system specifications.
Right, AoTS is one of the few games that can utilize AMD's otherwise bottlenecked uArch to its fullest potential. So RX 480 is only going to be slightly above R9 390X in this case. In DX11 games and other places where GCN architecture is used to a fraction of its power is where RX 480 could punch up to Fury levels.
post #332 of 383
Quote:
Originally Posted by variant View Post

The dual 480 got 62.5 fps with these specifications. A dual 390X with the same settings and similar specifications got 58.9 fps. A different game version, but there isn't a significant change from 1.0.18769 to 1.12.19928 for the 390X.

Another dual 480 got 66 fps at Extreme 1440p while another dual 390X got 66.6 fps with similar system specifications.
yeah but they claimed x1.83 CF scaling in AotS for 2x 480

which means 480 can be/is weaker then 390X solo, but can equal/slightly surpass it in CF

since Im pretty sure 390X doesnt have CF scaling as high as 1.83


or maybe they just messed up the CF scaling number ..
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post #333 of 383
Quote:
Originally Posted by lolerk52 View Post

Right, AoTS is one of the few games that can utilize AMD's otherwise bottlenecked uArch to its fullest potential. So RX 480 is only going to be slightly above R9 390X in this case. In DX11 games and other places where GCN architecture is used to a fraction of its power is where RX 480 could punch up to Fury levels.

We hope, that is. There's still just not enough solid info to base any true expectations on. I'm still hoping we get a 980Ti level card at $300 like the early rumors suggested but a $200 980 is still very solid. Anything less than that though becomes far less so...
post #334 of 383
Quote:
Originally Posted by ChevChelios View Post

yeah but they claimed x1.83 CF scaling in AotS for 2x 480

which means 480 can be/is weaker then 390X solo, but can equal/slightly surpass it in CF

since Im pretty sure 390X doesnt have CF scaling as high as 1.83


or maybe they just messed up the CF scaling number ..

It's explicit multi-adapter. There should be no difference between how a multi-GPU 390X is handled and how a multi-GPU 480 is handled.
post #335 of 383
Quote:
Originally Posted by Majin SSJ Eric View Post

We hope, that is. There's still just not enough solid info to base any true expectations on. I'm still hoping we get a 980Ti level card at $300 like the early rumors suggested but a $200 980 is still very solid. Anything less than that though becomes far less so...
That's my hope yes.
post #336 of 383
Quote:
Originally Posted by ChevChelios View Post


so one 8GB 480 is approx 1.83 times slower in AotS then what their CF result showed ? Where would that put it ? 390 or 390X level ?

Not quite. When you go the other direction, you flip the division.

1 Card = 1.00 Performance Units
2 Cards = 1.83 Performance Units

2 cards are (2 cards / 1 card) 1.83x as fast as 1 card. 1 card is (1 card / 2 cards) 0.54x slower than 2 cards.
post #337 of 383
Quote:
Originally Posted by ChevChelios View Post


so one 8GB 480 is approx 1.83 times slower in AotS then what their CF result showed ? Where would that put it ? 390 or 390X level ?
83% faster is not the same as 83% slower.

Example... Card A reaches 180 fps, card B reaches 120 fps.

Card B slower than Card A;
(120 - 180)/180 *100 = -33%

Card A faster than card B;
(180 - 120)/ 120 *100 = 50%
post #338 of 383
Quote:
Originally Posted by NightAntilli View Post

83% faster is not the same as 83% slower.

Example... Card A reaches 180 fps, card B reaches 120 fps.

Card B slower than Card A;
(120 - 180)/180 *100 = -33%

Card A faster than card B;
(180 - 120)/ 120 *100 = 50%
Quote:
Originally Posted by AMD_Robert View Post

//EDIT: To clarify this, the scaling from 1->2 GPUs in the dual RX 480 test we assembled is 1.83x. The OP was looking only at the lowest draw call rates when asking about the 51%. The single batch GPU utilization is 51% (CPU-bound), medium is 71.9% utilization (less CPU-bound) and heavy batch utilization is 92.3% (not CPU-bound). All together for the entire test, there is 1.83X the performance of a single GPU in what users saw on YouTube. The mGPU subsystem of AOTS is very robust.

In this case there is nothing confusing about the wording. Dual 480s are 83% faster than a single one.
post #339 of 383
Quote:
Originally Posted by lolfail9001 View Post


In this case there is nothing confusing about the wording. Dual 480s are 83% faster than a single one.

Figure out the math. Though I still don't think it can apply to the frame rate in a linear fashion.
Edited by variant - 6/3/16 at 2:17pm
post #340 of 383
So I decided to try to use the GPU utilization specs given to figure out the frame rate. I tried to see if there was a weight in this frame rate average. The average came to 58.9, so there doesn't appear to be, at least if it's CPU bound?

So I worked to try to figure out what each batch would be at 100% GPU usage and then divided it by two to try to figure out the single GPU frame rate. I used 62 fps because there should only be about 0-1 fps change, assuming the dual 390X above remotely matches the GPU utilization. The CPU bottleneck should be close since the CPU is only slightly less clocked.

I then decided to take this dual 390X benchmark and applied the same GPU utilization just to see what numbers I would get in comparison to the actual single GPU benchmarks. The actual benchmarks are in parenthesis.


Edit: Updated numbers.
Edited by variant - 6/3/16 at 11:44pm
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