Exploring DirectX 12: 3DMark API Overhead Feature Test
by Ryan Smith & Ian Cutress on March 27, 2015 8:00 AM EST- Posted in
- GPUs
- Radeon
- Futuremark
- GeForce
- 3DMark
- DirectX 12
Integrated GPU Testing
Switching gears from high performance discrete GPUs, we have our integrated GPUs. From a high level overview the gains from DirectX 12 are not going to be quite as large here as they are with dGPUs due to the much lower GPU performance, but there is still ample opportunity benefit from increased draw call performance.
Here we have Intel’s Haswell CPUs, and AMD’s Kaveri APUs. We'll start off with the higher-end processors, the Intel Core i3/i5i7 and AMD A10/A8.
As expected, at the high-end the performance gains from DirectX 12 are not quite as great as they were with the dGPUs, but we’re still seeing significant gains. The largest gains of course are found with the AMD processors, thanks to their much stronger iGPUs. From DX11ST to DX12 we’re seeing a surprisingly large 6.8x increase in draw call performance, from 655K to 4,470K.
As to be expected, with a relatively weak CPU, AMD’s DX11 draw call performance isn’t very strong here relative to their strong GPU and of course our more powerful dGPUs. Still, it ends up being better than Intel (who otherwise has the stronger CPU), so we see AMD offering better draw call throughput at all levels. Ultimately what this amounts to is that AMD has quite a bit more potential under DX12.
Mantle meanwhile delivers a very slight edge over DX12 here, although for all practical purposes the two should be considered tied.
Meanwhile for the Intel CPUs, the gains from DX12 aren’t quite as large as with the AMD processors, but they’re still significant, and this is why Intel is happily backing DX12. All 3 processors share the same GT2 GPU and see similar gains. Starting from a baseline of 625K draw calls under DX11 – almost identical to AMD – the i7-4790K jumps up by 3.2x to 2,033K draw calls under DX12. The i5 and the i3 processors see 1,977K and 1,874K respectively, and after adjusting for clockspeeds it’s clear that we’re GPU command processor limited at all times here, hence why even a 2 core i3 can deliver similar gains.
Intel does end up seeing the smallest gains here, but again even in this sort of worst case scenario of a powerful CPU paired with a weak CPU, DX12 still improved draw call performance by over 3.2x. This means that in the long run even games that are targeting lower-performance PCs still stand to see a major increase in the number of draw calls they can use thanks to DirectX 12.
The story is much the same with our lower performance processors. AMD continues to see the largest gains and largest absolute performance under DirectX 12. With a 7x performance increase for the A8, even this weaker processor benefits greatly from the use of a low-level API.
The Intel processors see smaller gains as well, but they too are similarly significant. Even the Pentium with its basic GT1 processor and pair of relatively low clocked CPU sees a 2.7x increase in draw call performance from DirectX 12.
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Mannymal - Sunday, March 29, 2015 - link
The article fails to address for the layman how exactly this will impact gameplay. Will games simply look better? Will AI get better? will maps be larger and more complex? All of the above? And how much?Ryan Smith - Sunday, March 29, 2015 - link
It's up to the developers. Ultimately DX12 frees up resources and removes bottlenecks; it's up to the developers to decide how they want to spend that performance. They could do relatively low draw calls and get some more CPU performance for AI, or they could try to do more expansive environments, etc.jabber - Monday, March 30, 2015 - link
Yeah seems to me that DX12 isn't so much about adding new eye-sandy its about a long time coming total back end refresh to get rid of the old DX crap and bring it more up to speed with modern hardware.AleXopf - Sunday, March 29, 2015 - link
I would love to see what effect directx 12 has on the cpu side. All the articles so far have been about cpu scalling with different gpus. Would be nice to see how amd compare to intel with a better use of their higher core count.Netmsm - Monday, March 30, 2015 - link
AMD is the thech's hero ^_^. always been.JonnyDough - Tuesday, March 31, 2015 - link
Great! Now all we need are driver hacks to make our over priced non-DX12 video cards worth their money!loguerto - Friday, April 3, 2015 - link
AMD masterpiece. Does this superiority has something to do with AMD Asynchronous Shaders? I know that nvidia's kerpel and maxwell asynchronous pipeline engine is not as powerful as the one in GCN architecture.perula - Thursday, April 9, 2015 - link
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Clorex - Wednesday, April 22, 2015 - link
On page 4:"Intel does end up seeing the smallest gains here, but again even in this sort of worst case scenario of a powerful CPU paired with a weak CPU, DX12 still improved draw call performance by over 3.2x."
Should be "powerful CPU paired with a weak GPU".
akamateau - Thursday, April 30, 2015 - link
FINALLY THE TRUTH IS REVEALED!!!AMD A6-7400 K CRUSHES INTEL i7 IGP by better than 100%!!!
But Anand is also guilty of a WHOPPER of a LIE!
Anand uses Intel i7-4960X. NOBODY uses RADEON with an Intel i7 cpu. But rather than use either an AMD FX CPU or an AMD A10 CPU they decided to degrade AMD's scores substanbtially by using an Intel product which is not optimsed to work with Radeon. Intel i7 also is not GCN or HSA compatible nor can it take advantage Asynchronous Shader Pipelines either. Only an IDIOT would feed Radeon GPU with Intel CPU.
In short Anand's journalistic integrity is called into question here.
Basically RADEON WOULD HAVE DESTROYED ALL nVIDIA AND INTEL COMBINATIONS if Anand benchmarked Radeon dGPU with AMD silicon. By Itself A6 is staggeringly superior to Intel i3, i5, AND i7.
Ryan Smith & Ian Cutress have lied.
As it stands A10-7700k produces 4.4 MILLION drawcalls per second. At 6 cores the GTX 980 in DX11 only produces 2.2 MILLION draw calls.
DX12 enables a $150 AMD APU to CRUSH a $1500.00 Intel/nVidia gaming setup that runs DX11.
Here is the second lie.
AMD Asynchronous Shader Pipelines allow for 100% multithreaded proceesing in the CPU feeding the GPU whether it is an integrated APU or an 8 core FX feeding a GPU. What Anand sould also show is 8 core scaling using an AMD FX processor.
Anand will say that they are too poor to use an AMD CPU or APU set up. Somehow I think that they are being disingenuous.
NO INTEL/nVidia combination can compete with AMD using DX12.