Rendering variation beetween AMD and INTEL

[fraggle]

Hello guys, while looking for my next hardware purchase, I find out this very interesting information.
So clearly you won't render the same scene on AMD than on INTEL, for still image it won't be noticeable but for an animation that will result in flickering.

[delineator]

Did you read the article? That is not the conclusion I draw (I would argue their own conclusion goes against the data the present, but whatever) - the conclusion is that due to the somewhat random nature of noise and passes, images differ time after time. This is reinforced by their Test 4 in which they see the same differences using Intel hardware for both. And both test 1 and test 2 show variations using the same exact hardware. Now of course we don't know HOW they are rendering (engine or settings), which makes this testing and article invalid.

[sirio76]

IMO their testing methodology and conclusions are wrong. They seems to know very little about render engine. I do render on both AMD and Intel using DR and results are 100% the same.

[delineator]

Yeah, we use a 5x5 tile grid split across 4 gens of intel processors (6XXXX series on up, plus one HEDT platform) and a Threadripper and 1st gen Ryzen thrown in. No difference. Honestly this stuff has been floating around for about 15 years (maybe longer) and alot of it comes down to blatant fanboy'ism between Intel and AMD. If you search on this very forum, there are even a few threads and I try to debunk them when I can because its based on pure nonsense. CPU's do math and they are very good at it. Software that runs our world from banking software to engineering software and render engines are comprised entirely of math. You would think if AMD was putting out a processor that DID MATH WRONG there would be much much large consequences than if an image looked slightly different.

[Stefan_Laub]

we also mix dual xeons and threadrippers, i have never seen a flicker or visible difference

[JD3D_CGI]

It does render different frames between AMD and Intel.

Not only a few years ago, but it's even done it recently.

it's nothing to do with fanboyism, and is to do with rounding differences,

[dougWilkinson]

we've also been rendering with mixtures of intel and AMD since the first ryzen and threadripper cpus were released. and never had any issues. Years of rendering with vray everyday and never noticed any issues related to intel vs amd.

[Alex_M]

Why would the frames be different? After all, every CPU executes the same exact code, no? Maybe there's something else going on? I use both AMD and Intel systems for rendering and I haven't experienced problems when rendering with both at the same time.

[I-REEL]

Same here, we use mixed amd / intel render nodes and we never had frame differences / flicking, I suspect this is a myth
However if your read the whole article, It suggests that switching from one intel cpu to another introduce similar variance than switching from amd to intel. And the whole thing looks like an info-mercial...