Ashes GPU Performance: Single & Mixed High-End GPUs

Since seeing is believing, we’ll start things off with a look at some direct captured recordings of Ashes running the built-in benchmark. These recordings showcase a Radeon R9 Fury X and a GeForce GTX 980 Ti in AFR mode, with each video swapping the primary and secondary video card. Both videos are captures with our 2560x1440 settings and with v-sync on, though YouTube limits 60fps videos to 1080p at this time.

Overall you’d be hard-pressed to find a difference between the two videos. No matter which GPU is primary, both setups render correctly and without issue, showcasing that DirectX 12 explicit multi-adapter and Ashes’ AFR implementation on top of it is working as expected.

Diving into our results then, let’s start with performance at 2560x1440.

Ashes of the Singularity (Alpha) - 2560x1440 - High Quality - 2x MSAA

It’s interesting to note that when picking these settings, the settings were chosen first and the cards second. So the fact that the GTX 980 Ti and R9 Fury X end up being so close in average performance comes as a pleasant surprise. With AFR performance gains dependent in part on how similar the two cards are, this should give us a better look at performance than cards that differ widely in performance.

In any case what we find is that with a single card setup the GTX 980 Ti and R9 Fury X are within 5% of each other with the older driver sets we needed to use for AFR compatibility. Both AMD and NVIDIA do see some performance gains with newer driver sets, with NVIDIA picking up 8% while AMD picks up 5%.

But more importantly let’s talk about mutli-GPU setups. If everything is working correctly and there are no unexpected bottlenecks, then on paper in mixed GPU setups we should get similar results no matter which card is the primary. And indeed that’s exactly what we find here, with only 1.4fps (2%) separating the GeForce + Radeon setups. Using the Radeon Fury X as the primary card gets the best results at 70.8fps, while swapping the order to let the GTX 980 Ti lead gives us 69.4fps.

However would you believe that the mixed GPU setups are faster than the homogenous setups? Trailing the mixed setups is the R9 Fury X + R9 Fury setup, averaging 67.1fps and trailing the slower mixed setup by 3.5%. Slower still – and unexpectedly so – is the GTX 980 Ti + GTX Titan X setup, which averages just 61.6fps, some 12% slower than the GTX 980 Ti + Fury X setup. The card setup is admittedly somewhat unusual here – in order to consistently use the GTX 980 Ti as the primary card we had to make the secondary card a GTX Titan X, seeing as how we don’t have another GTX 980 Ti or a third-tier GM200 card comparable to the R9 Fury – but even so the only impact here should be that the GTX Titan X doesn’t get to stretch its legs quite as much since it needs to wait on the slightly slower GTX 980 Ti primary in order to stay in sync.

Ashes of the Singularity (Alpha) - 2560x1440 - Multi-GPU Perf. Gains

Looking at performance from the perspective of overall performance gains, the extra performance we see here isn’t going to be chart-topping – an optimized SLI/CF setup can get better than 80% gains – but overall the data here confirms our earlier raw results: we’re actually seeing a significant uptick in performance with the mixed GPU setups. R9 Fury X + GTX 980 Ti is some 75% faster than a single R9 Fury X while GTX 980 Ti + R9 Fury X is 64% faster than a single GTX 980 Ti. Meanwhile the dual AMD setup sees a 66% performance gain, followed by the dual NVIDIA setup at only 46%.

The most surprising thing about all of this is that the greatest gains are with the mixed GPU setups. It’s not immediately clear why this is – if there’s something more efficient about having each vendor and their drivers operating one GPU instead of two – or if AMD and NVIDIA are just more compatible than either company cares to admit. Either way this shows that even with Ashes’ basic AFR implementation, multi-adapter rendering is working and working well. Meanwhile the one outlier, as we briefly discussed before, is the dual NVIDIA setup, which just doesn’t scale quite as well.

Finally let’s take a quick look at the GPU utilization statistics from MSI Afterburner, with our top-performing R9 Fury X + GTX 980 Ti setup. Here we can see the R9 Fury X in its primary card role operate at near-100% load the entire time, while the GTX 980 Ti secondary card is averaging close to 90% utilization. The difference, as best as we can tell, is the fact that the secondary card has to wait on additional synchronization information from the primary card, while the primary card is always either rendering or reading in a frame from the secondary card.

3840x2160

Now we’ll kick things up a notch by increasing the resolution to 3840x2160.

Ashes of the Singularity (Alpha) - 3840x2160 - High Quality - 2x MSAA

Despite the fact that this was just a resolution increase, the performance landscape has shifted by more than we would expect here. The top configuration is still the mixed GPU configuration, with the R9 Fury X + GTX 980 Ti setup taking the top spot. However the inverse configuration of the GTX 980 Ti + R9 Fury X isn’t neck-and-neck this time, rather it’s some 15% slower. Meanwhile the pokey-at-2560 dual NVIDIA setup is now in second place by a hair, trailing the mixed GPU setup by 10%. Following that at just 0.1fps lower is the dual AMD setup with 46.7fps.

These tests are run multiple times and we can consistently get these results, so we are not looking at a fluke. At 3840x2160 the fastest setup by a respectable 10.5% margin is the R9 Fury X + GTX 980 Ti setup, which for an experimental implementation of DX12 unlinked explicit multi-adapter is quite astonishing. “Why not both” may be more than just a meme here…

From a technical perspective the fact that there’s now a wider divergence between the mixed GPU setups is unexpected, but not necessarily irrational. If the R9 Fury X is better at reading shared resources than the GTX 980 Ti – be it due to hardware differences, driver differences, or both – then that would explain what we’re seeing. Though at the same time we can’t rule out the fact that this is an early tech demo of this functionality.

Ashes of the Singularity (Alpha) - 3840x2160 - Multi-GPU Perf. Gains

As you’d expect from those raw numbers, the best perf gains are with the R9 Fury X + GTX 980 Ti, which picks up 66% over the single-GPU setups. After that the dual AMD GPU setup picks up 50%, the dual NVIDA setup a more respectable 46%, and finally the mixed GTX 980 Ti + R9 Fury X setup tops out with a 40% performance gain.

Finally, taking a quick look of GPU frametimes as reported by Ashes internal performance counters, we can see that across all of the mutli-GPU setups there’s a bit of a consistent variance going on. Overall there’s at least a few milliseconds difference between the alternating frames, with the dual NVIDIA setup faring the best while the dual AMD setup fares the worst. Otherwise the performance leader, the R9 Fury X + GTX 980 Ti, only averages a bit more variance than the dual NVIDIA setup. At least in this one instance, there’s some evidence to suggest that NVIDIA secondary cards have a harder time supplying frame data to the primary card (regardless of its make), while NVIDIA and AMD primary cards are similar in read performance.

Ashes of the Singularity: Unlinked Explicit Multi-Adapter w/AFR & The Test Ashes GPU Performance: Single & Mixed 2012 GPUs
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  • Grimsace - Tuesday, October 27, 2015 - link

    Nvida and AMD both have a history of re-branding cards with the same gpus. Nvidia SLI requires that the cards are the exactly the same model (i.e. GTX 760 with another GTX 760). While AMD still allow you to crossfire the cards as long as they have the same basic architecture (i.e. Radeon 7870 and an R9 280X). Reply
  • Ryan Smith - Monday, October 26, 2015 - link

    "What about pairing the IGP with a low end discrete part where the performance gap is much smaller? "

    Right now it would still be too slow. Oxide is only ready to test Ashes on high-end hardware at this point.

    "This pre-beta requires very high-end hardware and should only be joined by people with substantial technical expertise and experience in real-time strategy games.

    These builds are buggy, gameplay is very incomplete and it'll probably kill your pets."

    Which is not to say that I'm not curious as well. But it's one of those matters where Ashes needs some more development work before they're ready to show off any kind of fusion involving an iGPU.
    Reply
  • JamesDax3 - Monday, October 26, 2015 - link

    Intel iGPUs may not be up to par but AMD APUs should be. Would love to see this done with an A10-7870K paired with a R7 360/370 or GTX 950/960. Reply
  • naretla - Tuesday, October 27, 2015 - link

    Intel Iris Pro actually outperforms AMD APUs: http://www.tomshardware.com/reviews/intel-core-i7-... Reply
  • silverblue - Tuesday, October 27, 2015 - link

    ...for double the price. Will Intel's parts also benefit from DX12? Reply
  • nathanddrews - Tuesday, October 27, 2015 - link

    It always costs more to get better performance. Why would that suddenly change in the case of Iris Pro vs APU? If you recall, Intel has been showing DX12 demos on Haswell, Broadwell, and Skylake for some time now. Skylake has been confirmed to support feature level 12_1. Reply
  • silverblue - Tuesday, October 27, 2015 - link

    That doesn't necessarily mean it'll perform better at DX12 than in DX11; ask NVIDIA. However, NVIDIA's DX11 performance is that good, it's little surprise they're not benefitting with DX12.

    It does cost more to get better performance, you're right, however until Broadwell, Intel hadn't provided something to challenge AMD on the desktop. Intel's CPUs generally did cost more regardless of the strength of their IGP.
    Reply
  • nathanddrews - Wednesday, October 28, 2015 - link

    I'm not sure I follow your post. Intel is more expensive than AMD because they get better CPU performance AND better IGP performance (Iris Pro only). They have also shown - in demos and game engines - that DX12 performance is better than DX11 performance.

    Not sure what NVIDIA has to do with this...
    Reply
  • looncraz - Wednesday, October 28, 2015 - link

    It better for twice the money!

    AMD could easily build an APU twice as fast, but memory bandwidth is a real issue.

    We will see what they have up their sleeves on the coming year...
    Reply
  • patrickjp93 - Wednesday, October 28, 2015 - link

    How can bandwidth be the issue when Intel gets around it so easily? Even without eDRAM HD 6000 smacks Kaveri upside the head. Maybe Intel's just better at the integrated game... Reply

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