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2nd September 2020, 10:00 | #60042 | Link | |
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Am I the only one who feel bullshit in the air? It's like amd would say that a 6 cores SMT CPU is 12 cores. And if that's the case then why nvidia felt the need to lie like this, instead of put out good marketing for "hyperthreading"? I guess we will have to wait for benchmarks...
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2nd September 2020, 10:16 | #60043 | Link |
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the more you look at it the clearer it get's it 3090 has 2 set of ~5k cuda cores in turing one set was INT32 and the other normal CUDA FP32 in ampare they seem to be able to switch between INT32 and FP32 i have no clue if all core can do that or only half.
we will know when official data is available with the INT32 performance. |
2nd September 2020, 12:29 | #60044 | Link |
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The "CUDA cores" were always a bit of theoretical thing, its not like you can access them individually. But if it can handle twice as many operations per tick, does that really conflict with saying it has twice as many cores?
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2nd September 2020, 14:35 | #60046 | Link |
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The CUDA core definition has not changed from Turing to Ampere.
But the scenarios where you can utilize 100% of CUDA cores are sometimes limited as the streaming multiprocessor has been reworked to do FP+FP, FP+INT, etc., rather than FP *or* INT. |
2nd September 2020, 15:36 | #60048 | Link | |
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2nd September 2020, 16:01 | #60049 | Link |
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No, thats hardly the same thing, because SMT doesn't actually mean it can run twice the instructions. Its an apples to oranges comparison entirely.
The CUDA core layout was reportedly changed so that it actually has hardware to run two FP32 computations, instead of just one.
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2nd September 2020, 17:26 | #60050 | Link |
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Hm, cheers.
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2nd September 2020, 20:32 | #60053 | Link | |
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What do you need it for? Gaming? then yes. Do you need the new inventions, HDMI 2.1/AV1? yes, again. Would you only use it for madvr? then good question. Do you need RTX for it at all?! A used Pascal 1080/Ti would be cheaper There's no point "future proofing" unless you need those features right now. Yes, but personally I don't need this.
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2nd September 2020, 20:46 | #60054 | Link |
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If you're upscaling lower resolutions at 60fps then faster speeds are warranted. How much so depends on far too many factors for anyone to realistically answer. I would also not buy an RTX card banking on the fact that madshi is going to be building new tensor core algorithms. He absolutely IS building new tensor core algorithms. However, we have no guarantees at all that they will ever see the light of day in madvr on a PC. They may, but, that's not a selling point of a new card. So right now, all that matters is raw speed. I personally use copyback D3D because I want menus when I stick a disc in the machine. The faster memory speeds on the new 30xx series may or may not improve things on that front. It remains to be seen if the 2xfp32 will have a real impact on what can be done in madvr, as well. These are all unknowns until we get the cards in our hands. But ultimately what card is right for you depends on your needs/wants/desires and what content you will be viewing and on what type of screen. I'm running a 2070 right now which does 99% of what I want. If I wasn't also into gaming and looking to avoid picking up a new console, I might not even bother chasing after the use case I'm looking at solving with a new card and just stick with the 2070. But I weighed the options for myself, and I see the 30xx cards as being a very useful upgrade overall. YMMV
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2nd September 2020, 23:00 | #60055 | Link | |
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they have double the CUDA core per SU or they can do FP32x2 i have a hard time believing they can do both at the same time. |
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2nd September 2020, 23:53 | #60056 | Link | |
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2nd September 2020, 23:59 | #60057 | Link |
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I have a 1080 non-Ti and I can barely play back 2160p60 to a UHD TV without dropping frames using madVR. I had to dial things way back to like bicubic chroma upscaling and most other stuff turned off. I wouldn't consider a Pascal card if that's what you want to do.
Edit: I should add that I couldn't find settings to let me play back HDR 2160p60 without dropped frames if it doesn't have black bars. SDR is okay. Last edited by Stereodude; 3rd September 2020 at 00:07. |
3rd September 2020, 00:25 | #60058 | Link | |
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Is there any reason you're using 2160p60? Doesn't your TV support lower resolutions? |
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3rd September 2020, 00:42 | #60059 | Link |
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He must be talking about 60fps content, like Gemini Man, and also using tone mapping at the same time. I don't use tone mapping, but my GTX 960 can easily play such content.
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3rd September 2020, 00:46 | #60060 | Link | |
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In this case I would probably do the same thing. If you double the FP32 units you have to double the reported core count, everyone knows each core is a FP32 unit. But then architecturally the way you got double the FP32 units did not double everything traditionally included in a CUDA core. With no good way to define GPU "cores" in the first place, and consumers not getting excited by architectural details, Nvidia had no option but to be confusing... and they picked the confusion that made them look better. But this is not like SMT either, there really is twice the hardware we traditionally cared about in a GPU core. It is not a doubling of the front end to better utilize idle hardware or similar.
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