DirectX 12 Explicit Multi-GPU Tested In Ashes of the Singularity

Feb 24, 2016
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Our Testing, Results, and Conclusion So Far

Our Testing

 

Testing with limited resources we wanted to bring the most comprehensive results that we could.

We had a small collection of gpus; R9 285 (2gb), R9 Nano, and a R9 295x2 (wouldn’t work under dx12 except for one core when paired with the Nano) All tests were done with Async Compute enabled.

We tested across three platforms;

  • a88x with A10 7870k
  • z87 with i7 4770k
  • z170 with i5 6400

All processors and graphics cards were ran at stock speeds

The remaining components of each setup used;

  • Skill Trident X 2x8gb DDR3 2400mhz
  • Skill Trident Z 2x8gb (ran at 2133mhz)
  • Visiontek 240gb miniSSD
  • CoolerMaster V1200 Platinum PSU
  • Sapphire R9 285 ITX compact (2gb)
  • AMD Radeon R9 Nano

Driver Packaging Version provided by AMD for these tests

15.301-160210a-299275E

 

The benchmark for AotS was run with the ‘STANDARD’ preset at 1080p across all processor and graphics card configurations.

2016-02-24_00001

 

We started off with the A10 7870k running through both DX11 and DX12 with first the R9 285 then the R9 Nano and finished off with seeing where Explicit Multi-Adapter stands at the moment.

7870k 285 7870k Nano

Interestingly enough the R9 285 takes a serious pounding in this test.  The R9 285 does so bad to the point that even the iGPU in EMA that was able to boost it up whereas the disparity between the Nano and the iGPU really show that this isn’t a recommended configuration and highly inadvisable.

 

The i5 puts up some much better numbers, even at a much lower clock speed showing that IPC is still important in the world of DX12.  We were not able to run EMA with the intel HD530 as the game did not recognize the iGPU.

6400 285 6400 Nano

Still the R9 285 takes a beating.  This time we see the Nano making a massive leap showing the api is taking full advantage of the total system.

 

With the i7 we see very similar results to the i5, but this time we toss in a curve ball to the mix.  We pair the R9 Nano and the R9 285 then again with the R9 Nano and a R9 290x.  The Results were interesting to say the least.

4770k 285  4770k Nano

Nano2854770k EMA

While the Nano+285 yields no improvement, staying within margin of error, the R9 Nano and R9 290x show some decent games, but mostly noticeable in the Medium and Heavy Batches.  This shows how well the load is handled across both graphics cards as the load increases.

 

Taking a look back comparing the i5 and i7, looks like hyper-threading doesn’t do much good here.

*keep in mind the i5 6400 operates at 2.7ghz-3.2ghz boost and the i7 4770k runs at 3.5ghz-3.9ghz boost.*

i5VSi7

 

Conclusion So Far

It’s good to these DX12 features finally available to the public and they are working. There’s still a road to go before these features are out of Beta and more available in other titles we could see a shift in upgrade paths where people are holding on to their old gpu for a bit longer as well as making some interesting combinations.  We would love to have tested along with an Nvidia gpu, but the only one available at the time is a GTX 770 but it wouldn’t launch in DX12 so we were unable to compile any results from that configuration.

 

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