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Intrinsic on 24 February 2019
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HoloDust said:
Intrinsic said:

 

  • Yes. In a rendering pipeline resolution is one of the things that scale proportionally. So if you are going for 4 times the rez you either need 4 times the power or 4 times the rendering time. But there are things that dont scale up at all unless a dev specifically wants them to (eg geometry). Another thing to consider is that the number you are told (eg 4.2TF, 1.8TF) doesn't mean that at any one time all of that GPU is fixed on driving rez. This is a very loose description, but say out of that 1.8TF 900Gflops was used solely for the rez part of the pipeline for a 1080p, then if you want the same game running in 4k you will need 3.6TF. 

@bold If you look up benchmarks, it's actually mostly 2-3x for 1080p to 4K UHD, depending on engine, API and GPU architecture.

Here's some of the latest for 1660Ti (link is for Metro Exodus, there are others games in review as well):

https://www.guru3d.com/articles_pages/asus_rog_strix_geforce_gtx_1660_ti_review,14.html

As you can see in the other part I bolded I clarified that. Yes in the real world you wont need 4x the actual physical total TF rating of a GPU to go from 1080p to 4k because the whole of the GPU isnt being used for the rez to begin with. But what of it is will usually scale directly t the chosen rez.

And if you look at that link you sent me and do the math... the only thing they changed was the resolution, the 2080 ran the game at ultra preset in 1080p at 76fps. When they switched it to 4k that dropped to 50fps. Thats about a 34% drop in performance. That doesn tell us what the part of the GPU that focuses on rez is actually using.

Last edited by Intrinsic - on 24 February 2019