DirectX 12 Multi-GPU Performance

Shifting gears, let’s take a look at multi-GPU performance on the latest Ashes beta. The focus of our previous article, Ashes’ support for DX12 explicit multi-GPU makes it the first game to support the ability to pair up RTG and NVIDIA GPUs in an AFR setup. Like traditional same-vendor AFR configurations, Ashes’ AFR setup works best when both GPUs are similar in performance, so although this technology does allow for some unusual cross-vendor comparisons, it does not (yet) benefit from pairing up GPUs that widely differ in performance, such as a last-generation video card with a current-generation video card. None the less, running a Radeon and a GeForce card together is an interesting sight, if only for the sheer audacity of it.

Meanwhile as a result of the significant performance optimizations between the last beta build and this latest build, this has also had an equally significant knock-on effect on mutli-GPU performance as compared to the last time we looked at the game.

Ashes of the Singularity (Beta) - 3840x2160 - High Quality - MGPU

Even at 4K a pair of GPUs ends up being almost too much at Ashes’ High quality setting. All four multi-GPU configurations are over 60fps, with the fastest Fury X + 980 Ti configuration nudging past 70fps. Meanwhile the lead over our two fastest single-GPU configurations is not especially great, particularly compared to the Fury X, with the Fury X + 980 Ti configuration only coming in 15fps (27%) faster than a single GPU. The all-NVIDIA comparison does fare better in this regard, but only because of GTX 980 Ti’s lower initial performance.

Digging deeper, what we find is that even at 4K we’re actually CPU limited according to the benchmark data. Across all four multi-GPU configurations, our hex-core overclocked Core i7-4960X can only setup frames at roughly 70fps, versus 100fps+ for a single-GPU configuration.


Top: Fury X. Bottom: Fury X + 980 Ti

The increased CPU load from utilizing multi-GPU is to be expected, as the CPU now needs to spend time synchronizing the GPUs and waiting on them to transfer data between each other. However dropping to 70fps means that Ashes has become a surprisingly heavy CPU test as well, and that 4K at high quality alone isn’t enough to max out our dual GPU configurations.

Ashes of the Singularity (Beta) - 3840x2160 - Extreme Quality - MGPU

Cranking up the quality setting to Extreme finally gives our dual-GPU configurations enough of a workload to back off from the CPU performance cap. Once again the fastest configuration is the Fury X + 980 Ti, which lands just short of 60fps, followed by the Fury X + Fury configuration at 55.1fps. In our first look at Ashes multi-GPU scaling we found that having a Fury X card as the lead card resulted in better performance, and this has not changed for the newest beta. The Fury continues to be faster at reading data off of other cards. Still, the gap between the Fury X + 980 Ti configuration and the 980 Ti + Fury X configuration has closed some as compared to last time, and now stands at 11%.

Backing off from the CPU limit has also put the multi-GPU configurations well ahead of the single-GPU configurations. We’re now looking at upwards of a 65% performance boost versus a single GTX 980, and a smaller 31% performance boost versus a single Fury X. These are smaller gains for multi-GPU configurations than we first saw last year, but it’s also very much a consequence of Ashes’ improved performance across the board. Though we didn’t have time to test it, Ashes does have one higher quality setting – Crazy – which may drive a bit of a larger wedge between the multi-GPU configurations and the Fury X, though the overhead of synchronization will always present a roadblock.

DirectX 12 Single-GPU Performance DirectX 12 vs. DirectX 11
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  • itchypoot - Wednesday, February 24, 2016 - link

    Continuing the trend of nvidias very bad DX12 performance. Reply
  • Sttm - Wednesday, February 24, 2016 - link

    Wouldn't you need multiple data points to have a trend, and as this is really the only DX12 game, you do not have that do you?

    No what we have here is one game where one side has an advantage, and a fanboy for that side shouting how it means everything. As if we haven't seen that 1000 times before.
    Reply
  • itchypoot - Wednesday, February 24, 2016 - link

    Nothing of the sort, but you resort to insult because you have no substance. Likely you fit that description and see everyone else as being the same.

    There are other DX12 metrics available, nvidia continues to do poorly in them. Make yourself aware of them and return with data rather than insults.

    Nvidia+DX12 = unfortunate state of affairs
    Reply
  • willis936 - Wednesday, February 24, 2016 - link

    "Make yourself aware of them so I don't have to make my own arguments" Reply
  • flashbacck - Wednesday, February 24, 2016 - link

    Lol. This is pretty fantastic. Reply
  • close - Thursday, February 25, 2016 - link

    Given that we only have (almost) one DX12 game available I wouldn't worry too much about the performance of any of the two players. By the time enough games are available to actually care about DX12 I assume both will be more than ready to deliver. Reply
  • HalloweenJack - Thursday, February 25, 2016 - link

    so by the summer then - oh wait , tomb raider IS DX12 , on console - but Nv threw enough money at the dev to make it DX11 on the pc.... Reply
  • close - Thursday, February 25, 2016 - link

    Complaining (or worrying) about DX12 performance at this point is pointless. The whole ecosystem is very much in beta stages starting with the only version of Windows that supports DX12, Windows 10. The OS, the drivers, the games, they are all in a phase where they are subject to pretty big changes. Even the hardware will start supporting different subsets of DX12 in the future. And the title sums it up pretty well: "a beta look".

    But some people just need a reason to complain, to lament, to try on some sarcasm, etc. Only time will tell which platform will be "the best" and for how long once all the development is done. But what I can tell you right now is that both players will be "good enough".

    P.S. Regardless of which side you're on, being a fanboy only works when you have the very top end product. So unless you have a FuryX or a 980Ti/Titan X pointing fingers at the performance of the competition is like driving a Fiesta and thinking it's a sort of Mustang.
    Reply
  • silverblue - Thursday, February 25, 2016 - link

    What about a Fiesta ST? (yes, I'm trolling, albeit mildly) Reply
  • MattKa - Thursday, February 25, 2016 - link

    What a load of shit. Nvidia threw money at them to make it DX11?

    It's not DX12 on X-Box you uninformed baboon. In fact Crystal Dynamics is going to be patching DX12 support into the game.

    You joker.
    Reply

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