Rendering farm, built from unused PC's
Hey there - my name is micahel and I am new to this board and also new to world of computer building. Some background: I work for a very small architect in Portland, and the guy that had the job before me bought inferior machines and I have been building customs to help improve our technology pieces. Daniel at Logical Increments has been a source of help and guidance and he suggested that I reach out to this forum to help me with a question - how can I utilize the old PC's by using their CPU power to create one rendering station? Any thoughts? Please forgive me if I am barking up the wrong tree. 
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You should probably add a padding of the antialiasing size to the size of each section before rendering, to avoid any antialiasing problems (like adding 16px on both dimensions when using a 16x antialias), then when merging them back you can discard this padding.
I'm not sure if this would make any difference though (maybe in real-time renderers, not offline), I would compare the results and look for any pixel differences around the edges of the sections to see if this is true.
Those computers look really old. I assume one geforce 2080 is faster than all four CPUs in there.
If possible build a GPU cluster instead.
Put them all in a network, turn it on and go...
Older versions of mental ray were temperamental about differing pc specs on a farm but I doubt that's an issue these days