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Old 3rd February 2021, 13:05   #61  |  Link
excellentswordfight
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Just to add some numbers regarding utilization with threading options left at default:

--main10 --preset slow --crf18 on an 24C/48T Eypc Rome:

1080p Bluray source:

With CTU 64 & Merange 57: 25-35%
With CTU 32 & Merange 26: 50-70%

2160p UHD Bluray source:

With CTU 64 & Merange 57: 50-95% (24threads pinned at 100%, the other 24 is very unstable).

1080p with CTU 32, and UHD at default should give great saturation up to 16/32 for single instance encoding. 5950X is likely the fastest single instance encoding processor you can get for these cases atm (I would guestimate that it would beat 3960X & whatever intel has to offer including all xeons).

Last edited by excellentswordfight; 3rd February 2021 at 13:28.
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Old 3rd February 2021, 15:47   #62  |  Link
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CPU usage should be even higher if you do some heavy filtering like denoising in avisynth (MDegrain + prefetch 24)
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Old 3rd February 2021, 23:30   #63  |  Link
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CPU usage should be even higher if you do some heavy filtering like denoising in avisynth (MDegrain + prefetch 24)
But how many threads can those algorithms usefully use at once? Temporal denoising can be hard to parallelize because it is an interframe analysis process. But possible if each frame is doing forward and backward comparisons without reusing other analysis of the same frames. Can double the total CPU, but offer a lot better parallelism.
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Old 4th February 2021, 00:05   #64  |  Link
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Modern video processing frameworks relying on caches, no need to compute stuff twice. Just pick cached frame and reuse or fallback to full processing on cache misses. With high amount of RAM MDergain is fast enough.
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Old 4th February 2021, 21:55   #65  |  Link
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But how many threads can those algorithms usefully use at once? Temporal denoising can be hard to parallelize because it is an interframe analysis process. But possible if each frame is doing forward and backward comparisons without reusing other analysis of the same frames. Can double the total CPU, but offer a lot better parallelism.
MDegrain works very well with prefetch equal to number of physical cores.
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Old 18th August 2021, 13:36   #66  |  Link
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Hi,
Does anyone already compare 3900X and 5900X in real conditions (x265 1080p and 4K) ? With the same settings, what is the expected perf difference between both ?
Thanks !
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Old 18th August 2021, 17:36   #67  |  Link
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Hi,
Does anyone already compare 3900X and 5900X in real conditions (x265 1080p and 4K) ? With the same settings, what is the expected perf difference between both ?
Thanks !
Just look at the new benchmark thread from Sagitarre.

https://forum.doom9.org/showthread.php?t=174393&page=4

The 3900x is barely ahead of the 5800x.
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Old 27th August 2021, 14:13   #68  |  Link
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Just look at the new benchmark thread from Sagitarre.

https://forum.doom9.org/showthread.php?t=174393&page=4

The 3900x is barely ahead of the 5800x.
Thanks
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Old 3rd September 2021, 07:31   #69  |  Link
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I've just ordered an AMD 5900x and RTX 3080 for encoding (NVENC still has a few use cases outside of streaming). The reason for the 5900x (or even going for a 3000-series or any other 5000-series) is power savings, less heat, and better value for money with multithreaded workloads such as encoding. As it stands, I would recommend AMD (I believe that's the first time I've written that since I purchased an Athlon 64 X2 as a child!).
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Old 12th September 2021, 14:13   #70  |  Link
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Intel processors (11 gen) with the internal video card UHD Graphics 750 are good for x265 encoding? or better to buy an AMD processor without internal video card?
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Old 12th September 2021, 21:04   #71  |  Link
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I assume AMD will be better (HW encoding usually performs worse than SW), and 8 big + 8 small cores might make things slower against full-power 16 cores by AMD. So just wait for actual release and check speed comparisons before buy.
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Old 13th September 2021, 17:42   #72  |  Link
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Intel processors (11 gen) with the internal video card UHD Graphics 750 are good for x265 encoding? or better to buy an AMD processor without internal video card?
There's no downside to having an integrated GPU, but there's no upside either for x265 itself. Depending on workflow, the GPU can be used to accelerate source decode and potentially some preprocessing operations. And there's the potential to use a HW first pass and the reuse the initial analysis in x265 for a moderate speed boost, but it's a hassle to get configured, and speed up is maybe 25% if done without quality loss.

I don't know anyone doing that in practice for file-to-file encoding.
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Old 13th September 2021, 17:50   #73  |  Link
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Intel processors (11 gen) with the internal video card UHD Graphics 750 are good for x265 encoding? or better to buy an AMD processor without internal video card?
Intel's latest generation CPUs are power consuming monsters. Keep that also in mind. I'd opt for an AMD at the moment
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Old 16th September 2021, 09:47   #74  |  Link
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You can root Intel Chipset Minix OS and get access to ucode and modify it. So Intel, of course. What a dumb question! Just simply picosecond precision digital analyser inside is already equvivalent to millions of $.
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Old 20th September 2021, 19:13   #75  |  Link
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I'm also searching for new CPU, Ryzen 7 5800X would be my max budget, is this the best what I can buy for that money?
What fps should I expect on 5800X encoding x265 from 1080p, AVC source using CRF profile fast?
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Old 20th September 2021, 19:39   #76  |  Link
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There's no downside to having an integrated GPU, but there's no upside either for x265 itself.
All ryzen cpus with a integrated GPU have a smaller L3 cache. So there's a small downside
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Old 20th September 2021, 19:42   #77  |  Link
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Quote:
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I'm also searching for new CPU, Ryzen 7 5800X would be my max budget, is this the best what I can buy for that money?
What fps should I expect on 5800X encoding x265 from 1080p, AVC source using CRF profile fast?
Techpowerup has a decent test x265 test which you can use for some speed comparison between models.

https://tpucdn.com/review/intel-core...ncode-h265.png

Not sure about the speed as I rarely use preset fast, nor own an 5800x, but I would guestimate that it would be in in the 50fps+ range.

Last edited by excellentswordfight; 20th September 2021 at 21:15.
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Old 21st September 2021, 00:34   #78  |  Link
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Out of curiosity, still no AVX512 in the new AMD CPUs, right?
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Old 21st September 2021, 00:47   #79  |  Link
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Right, no AVX512 in any of the announced, or even rumored, AMD CPUs.

However, Zen3 CPUs encode with x265 very quickly, so the lack of AVX512 is not really a minus for x265 encoding.
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Old 21st September 2021, 15:59   #80  |  Link
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Intel 11th gen desktop igpu has a good hardware hevc encoder (in addition to an av1 hardware decoder).

avx512 isn't reported as being available with 12th gen Intel desktop (releasing Q4 2021).
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