zlatan said:Kepler is generally a strong architecture when the shaders are optimised for ILP. In this case all the cores can be used in any Kepler product. The only problem when you don't optimize your shaders for independent workloads, so Kepler will loose 33 percent of the theoretical performance. This is the case with GameWorks. These shaders just use 67 percent of the Kepler GPUs, so 33 percent of your shader cores will always be in idle.
Optimising for Kepler is really easy. There might be some workloads when it is not practical to find some independent operations for the idle cores, because of the register pressure, but many times this is not a problem.
The problems are the licences. With some specific codes NV won't allow the devs to optimize the shaders. They can see the source, but they don't able change it, and the original code will hurt Kepler. This is why some games don't run well on these products. Basically the licences won't allow the performance optimization.
That might as well. Although, look here. Supported.Highly likely Kepler has no proper Vulkan code on Doom, remember Vulkan and DX12 is arch based.
I suppose it's theoretically possible to optimize for kepler, but no developer is going to do that at this point. Nvdia will probably not be very supportive either, they'd rather have developers optimize for cards that are actually for sale.
The people running that old stuff are probably not buying games full price anyway.
The people running that old stuff are probably not buying games full price anyway.
I suppose it's theoretically possible to optimize for kepler, but no developer is going to do that at this point. Nvdia will probably not be very supportive either, they'd rather have developers optimize for cards that are actually for sale.
The people running that old stuff are probably not buying games full price anyway.
Nvidia could suggest things to make kepler perform better, but they've pretty much abandoned it when it comes to performance optimization. Though they will still fix bugs.I dont think there is anything Nvidia can do about it, everything on DX12 and Vulkan is on devs hands to optimise, this also happens on OpenGL?
Well, so that 33% performance loss...it has to be on Nvidia right? I mean, by all accounts the GTX 770, 780 and 780 Ti and Titan should all still be decent GPUs.
It's incredible how AMD's old GPUs are making almost 50% gains, and Nvidia's older GPUs simultaneously losing 33% performance!
I made posts on this topic awhile back. Kepler when running code optimized for Maxwell or GCN would lose 1/3 of it's performance. This is exactly what happens in many GameWorks titles. I didn't know zlatan had said the same thing.
Pascal in theory, should run GCN optimized code better than Maxwell, but I am not sure about GP104 due to its different arrangement to GP100 and the Pascal Whitepaper is mostly GP100 based.
It's interesting that zlatan brings up non-modifiable GameWorks libraries, in their default NV supplied state, they do gimp Kepler.
The people running that old stuff are probably not buying games full price anyway.
Kepler was announced in 2010, though.
Cards came out in early 2012.
So Kepler was likely designed in 2010.
GK110 was a different architecture from GK104.
It's cause the driver engineers at Nvidia can't afford to keep optimizing the shader compiler for the Kepler microarchitecture ...
AMD like Nvidia shares an intermediate GPU language such as AMDIL or NVPTX that gets converted from the generated HLSL/GLSL/SPIR-V bytecode but the big difference between the two IHVs is that AMD doesn't aggressively change it's ISA so much ...
That's one more reason why console manufacturers like AMD's current GPU microarchitectures is that they can bet that AMD is going to stay on GCN along with it's derivatives and be able to make them backwards compatible with the console APIs ...
"Old stuff?!" Today we are two years removed from a $700 780ti (980 was released in fall 2014). Only in smartphone land is two year old $700 hardware considered obsolete.
Heck the 7970 is from 2011!!!! And yet it still gains in new games.
If Nvidia isn't going to fully support two year old $700 hardware then they need to give up on pretenses and lease GPUs instead of selling them.
Actually never mind I don't want to give them "founder's edition" level ideas.