AMD explains image quality in AOTS Radeon RX 480 CF vs GTX 1080 demonstration

Published: Jun 2nd 2016, 11:35 GMT

AMD Radeon RX 480 in CrossFire

AMD Radeon RX 480 vs GTX 1080

AMD made a short Ashes of Singularity demonstration of Radeon RX 480 running in CF during Computex Polaris announcement. Such configuration was compared to NVIDIA’s GeForce GTX 1080, and according to AMD, RX 480 CF offers better framerate while being utilized at 151% 183% (single-GPU scaling,  via).

Robert Hallock (Head of Global Technical Marketing at AMD) shared more details about this demonstration. The first thing we learn are the exact benchmarks results performed by AMD:

GPUFPSSingle Batch GPU UtilizationMed Batch GPU UtilizationHeavy Batch GPU Utilization
2x Radeon RX 48062.5 fps 51.0%71.9 %92.3%
1x GTX 108058.7 fps98.7%97.9%98.7%

But more importantly Robert Hallock explained the ‘controversy’ over different image quality using competing hardware:

At present the GTX 1080 is incorrectly executing the terrain shaders responsible for populating the environment with the appropriate amount of snow. The GTX 1080 is doing less work to render AOTS than it otherwise would if the shader were being run properly.

It was also explained that each run of AOTS benchmark is randomized and it’s impossible to capture the same footage in each run. Furthermore we are told that prior to the announcement, this test was performed 10 times, and even at higher resolution (1440p), but the results were almost the same.

AMD Radeon RX 480 vs GTX 1080
 June 2nd, 2016AMD Radeon RX 480AMD Radeon RX 480 CrossFireNVIDIA GeForce GTX 1080
Graphics CorePolaris 10 (Ellesmere) XTPolaris 10 (Ellesmere) XTPascal GP104-400
Fabrication Process14nm FinFET14nm FinFET16nm FinFET
Unified Processors23042x 2304 (4608)2560
GPU Base Clock1266 MHz1266 MHz1607 MHz
Max Compute Performance5.83 TFLOPs2x 5.83 (11.66 TFLOPs)8.23 TFLOPs
Memory8 GB GDDR52x 8 (16 GB) GDDR58GB GDDR5X
Memory Bus Width256b2x 256 (512b)256b
Memory Clock (Effective)2000 MHz (8 GHz)2000 MHz (8 GHz)1250 MHz (10 GHz)
Memory Bandwidth256 GB/s2x 256  (512 GB/s)320 GB/s
TDP150W2x 150 (300W)180W
Launch Price<250 USD<500 USD600 USD (700 USD FE)

Here are more screen-grabs taken from the comparison by reddit user:

Left: Radeon RX 480 CF, Right GTX 1080

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Full statement follows:

Concerning the AOTS image quality controversy from Amd

AMD Radeon RX 480 in Doom 1080p/1440p VSR

Clubic took some footage of Radeon RX 480 being demoed with Doom shortly after the live stream ended. While the native resolution of this monitor is 1080p, it was also confirmed by Robert that this demo is using VSR @ 1440p.

Source: Reddit

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