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[pcper] NVIDIA Talks DX12, DX11 Efficiency Improvements - Page 12

post #111 of 203
Quote:
Originally Posted by Silent Scone View Post

To what are you referring to in those screenshots Alatar?

The blue lines left by the engines of the ships seem to be missing / greatly reduced at least in that screenshot (when using mantle).

That's what it seemed to me at least.
 
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post #112 of 203
I see it now. It's probably just the contrast making them fainter.
post #113 of 203
how are you sure that memory bandwidth doesnt effect the benchmark?
post #114 of 203
Quote:
Originally Posted by monstercameron View Post

how are you sure that memory bandwidth doesnt effect the benchmark?

Does it matter if it did? At 1500MHz (6000 effective) the Titan and the 280X have identical memory bandwidth.

(assuming your post was directed towards me)
 
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post #115 of 203
Quote:
Originally Posted by TK421 View Post

I really hope nvidia takes BF4 into consideration :|

have you considered that it might not be a driver issue and issue with the way the game is programed?
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post #116 of 203
Quote:
Originally Posted by monstercameron View Post

how are you sure that memory bandwidth doesnt effect the benchmark?


This bench doesn't strike me as particularly memory bound either.
post #117 of 203
Quote:
Originally Posted by Alatar View Post

Does it matter if it did? At 1500MHz (6000 effective) the Titan and the 280X have identical memory bandwidth.

(assuming your post was directed towards me)
The sad part is you believe that they are exactly equal. Even when you adjust clocks they still wont be equal. Comparable at best but you cant assure that the inherent difference in the physical components wont influence the outcome.
post #118 of 203
Well yes, identical theoretical bandwidth if we want to be accurate.

Doesn't really matter though when it comes to the findings, bandwidth isn't an issue at all in those cases.
 
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post #119 of 203
Quote:
Originally Posted by Alatar View Post

So with the DX11 efficiency talk I decided that I would do some small scale investigating.

Now since I do not have a 290 or a 290X I was forced to use my 280X. I OC'd the 280X and I downclocked my Titan so that they both offered about the same amount of GPU performance:

1100MHz 280X: http://www.3dmark.com/3dm/2734474
820MHz Titan: http://www.3dmark.com/3dm/2734934

Now since Star Swarm at stock settings is really inconsistent and doesn't offer similar results between different runs I used a custom scenario with a custom camera angle. This means that everything happens exactly the same between the runs and is viewed from the same angle as well. This means that Star Swarm works in the same way as any other normal bench. So running the custom scenario makes the results comparable between each other.

Here's the scenario if anyone else wants to test:

ScenarioCustom.csv 3k .csv file

Then I started testing both of the cards in the Star Swarm bench.

280X first:

DX11)



Mantle)



Then the Titan:

DX11)



Results (avg fps) :

280X DX11: 31.69 fps
280X Mantle: 42.52 fps
Titan DX11: 39.3 fps

Now remember that with these clocks the GPUs have approximately the same amount of GPU power (within a couple of per cent). And despite this:

Titan is 24% faster than 280X in DX11
280X is 8% faster than Titan when 280X is running mantle and Titan DX11.

Again, the cards are clocked so that GPU performance is comparable.


Conclusion:

Even in windows 7 there's a very clear advantage in favor of Nvidia when it comes to DX11 CPU overhead.

Check your own test numbers.
280X DX11 avg unit count 3961
280X Mantle avg unit count 4436
Titan DX11 avg unit count 4057

It most certainly isn't a directly comparable scenario (280X under mantle had more stuff going on on average). Even with the same amount of units I doubt we could possibly have identical twin runs. Mantle is obviously nondeterministic (AI does whatever it sees fit between different runs).
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post #120 of 203
Which is why I've personally paid zero attention to any results across message boards, and most likely why journalists have avoided using it in relation to anything Mantle. It's pretty, and the unit numbers are impressive - but as a benchmark it's an inconsistent pointless brick.
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