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Topics - Mattschia

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General Discussion / Interior Benchmark - AMD vs Intel
« on: 2018-01-01, 17:12:03 »
Hello Everyone, I've done some testing during the holidays and I tought to share the results bacause it could be useful for people who want to build a workstation.



Settings: 4k resolution | 25 Pass | GI 16 | Light Samples 4

INTEL 7980XE 18 Cores (36 Threads) @3800 Mhz (AVX):

Rays/s total 12.850.000
Time: 00:15:45


AMD Ryzen 1700 8 Cores (16 Threads) @3800 Mhz (AVX/2):

Rays/s total 4.200.000
Time: 00:45:20

(Combined Time in DR: 00:12:50)

Being both CPUs at the same frequency, if we consider a core to core comparison Intel CPU has 2,25x the amount of performance on paper, however in real life with Corona the performance is almost exactly 3x.

I think this is a mixture of slightly better IPC and full AVX implementation by Intel but maybe I'm missing something else.

Of course if we consider price/performance/power ratio AMD is the clear winner here (500,00 vs 2.500,00 EUR now for MB+CPU and 170W vs 450W) but I believe that in our field hardware cost for this type of consumer grade systems is quite manageable and what is left over time is a huge performance difference.

I thought this could be an interesting comparison as those 2 are the reference CPUs at the moment for a cost-oriented consumer workstation and a performance-without-compromise one, I believe the above numbers can easily transfer to AMD Threadripper and lower Intel i9 processors as well since it's actually the same architecture.

I expect that AMD 1950x at the same frequency would complete the above render in exactly half time with 00:22:00 vs 00:15:45 of the 7980XE.

This comparison is only good for Corona and in particular 1.7 version, the official benchmark uses version 1.3 core and after some testing i've noticed a smaller performance gap between the 2 architectures, not sure what happen under the hood but something is changed and most review websites are not telling the whole story in real life application.

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General Discussion / AVX-512
« on: 2017-10-25, 02:43:42 »
Hi eveyone,

I have a question for the developers and I believe it would be interesting for other users as well to know the answer.

Since I'm moving to Corona and I'm about to update my main workstation, I've been wondering if the AVX-512 implementation in some processors will be used by Corona in the near future and how much difference could it make. Considering the price of hardware it would be useful to know if a performance gain is to be expected choosing one brand over the other. Thanks.

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