Custom build best GPU

Hello, I am doing a custom build based on a Threadripper 1920X CPU. I have heard that AMD cards are best for DR 15 and was wondering which cards are recommended. This card will also be used to play games so the AMD 7100x is out. I am looking at the Radeon RX Vega 64 but it is really expensive. Are there other good alternatives such as the Vega 56? I want to be able to edit 4K footage and have at least two video tracks play in real time.

Thanks,

two streams of 4k is more about disk I/O really....

i can get there with some safety on dual 12core xeon's, dual 1080Ti's and 16 x 7200rpm spinning disk raid on SAS

would not be holding my breath with the AMD CPU/GPU options you are looking at, maybe with optimised media set to a lower bandwidth choice?

OK, thanks for the reply. I am currently using an Acer Predator 15 laptop with an i-7 6700 cpu and nvidia 970m gpu so it is really bad with 4k. There is so much information on the web about systems that work/don't work it is getting confusing. BM's list of recommended hardware is incomplete on some things so it is only partially helpful. Still confused as to what would work even with a single stream 4k and also gaming. Any more ideas? Thanks.

I have heard that AMD cards are best for DR 15 and was wondering which cards are recommended.

Where have you heard this? Almost every professional system I know of (with the exception of the disastrous Mac Pro trashcans) runs nVidia cards, either Quadros at facilities or Titans / 1080 Tis on smaller builds or freelancer machines. CUDA is just much more broadly supported than OpenCL, though that is slowly changing.

I work off an i9 7940 + 1080 Ti system that crushes 4K content, though I'd buy another 1080 Ti for better realtime TNR if the prices ever come down. I also have a much cheaper, older i7 + dual 980 machine at home that holds up just fine. Once you get over a certain hump with the GPU performance and number of CPU cores you're mostly going to be bottlenecked by VRAM, cache drive speeds and the amount of memory in your system.

I forget where I heard this but Resolve uses OpenCL instead of CUDA so that would mean AMD cards wouldn't it? If it does not make a difference I would gladly use Nvidia but do the i7 processors have the power of the Threadrippers?

Resolve supports OpenCL and CUDA. The downside of the OpenCL support is that we're bound to proprietary drivers. Otherwise, AMD cards would be a no-brainer. But currently, Geforce/CUDA offer a better package.

Almost every professional system I know of (with the exception of the disastrous Mac Pro trashcans) runs nVidia cards, either Quadros at facilities

Hopefully they run something else than Resolve on those things, then.