Sorry for going off topic. But your insight will be helpful on my build

I'm thinking about a low budget system, which will be using

1.X99 D8 MAX LGA2011-3 Motherboard - It has 4 pcie 3.0 x16 slots, dual cpu socket. They are priced around $260 with both the cpu

2. 4X AMD MI50 32G cards - They are old now, but they have 32 gigs of vram and also can be sources at $110 each

The whole setup would not cost more than $1000, is it a right build ? or something more performant can be built within this budget ?

I'd use caution with the Mi50s. I bought a 16GB one on eBay a while back and it's been completely unusable.

It seems to be a Radeon VII on an Mi50 board, which should technically work. It immediately hangs the first time an OpenCL kernel is run, and doesn't come back up until I reboot. It's possible my issues are due to Mesa or driver config, but I'd strongly recommend buying one to test before going all in.

There are a lot of cheap SXM2 V100s and adapter boards out now, which should perform very well. The adapters unfortunately weren't available when I bought my hardware, or I would have scooped up several.

Better to buy one used 3090 than those old cards. Everything is not vram. Or, you can do nothing without vram but you can’t do anything with just vram.

To use the second pair of pcie slots, you _must_ have two cpus installed. Just saying in case someone finds a board with just one cpu socket populated.