AMD Radeon RX 480 in CrossFire
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:
| GPU | FPS | Single Batch GPU Utilization | Med Batch GPU Utilization | Heavy Batch GPU Utilization |
|---|---|---|---|---|
| 2x Radeon RX 480 | 62.5 fps | 51.0% | 71.9 % | 92.3% |
| 1x GTX 1080 | 58.7 fps | 98.7% | 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, 2016 | AMD Radeon RX 480 | AMD Radeon RX 480 CrossFire | NVIDIA GeForce GTX 1080 |
| Graphics Core | Polaris 10 (Ellesmere) XT | Polaris 10 (Ellesmere) XT | Pascal GP104-400 |
| Fabrication Process | 14nm FinFET | 14nm FinFET | 16nm FinFET |
| Unified Processors | 2304 | 2x 2304 (4608) | 2560 |
| GPU Base Clock | 1266 MHz | 1266 MHz | 1607 MHz |
| Max Compute Performance | 5.83 TFLOPs | 2x 5.83 (11.66 TFLOPs) | 8.23 TFLOPs |
| Memory | 8 GB GDDR5 | 2x 8 (16 GB) GDDR5 | 8GB GDDR5X |
| Memory Bus Width | 256b | 2x 256 (512b) | 256b |
| Memory Clock (Effective) | 2000 MHz (8 GHz) | 2000 MHz (8 GHz) | 1250 MHz (10 GHz) |
| Memory Bandwidth | 256 GB/s | 2x 256 (512 GB/s) | 320 GB/s |
| TDP | 150W | 2x 150 (300W) | 180W |
| Launch Price | <250 USD | <500 USD | 600 USD (700 USD FE) |
Here are more screen-grabs taken from the comparison by reddit user:
Left: Radeon RX 480 CF, Right GTX 1080
Full statement follows:
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
