I have a workstation that had custom software that was made for it using an x79 motherboard. I ordered the exact revision and everything that I had before but while consulting with the people that made the software for me they said i could use up to a 4960x. the chips are super cheap now so im just curious which one i should get. they are roughly around the same price from the sources that I have atm. I know most people here won't know the performance of the app performance between the chips but I'm mostly just looking at what I do on the side which is gaming. I just wanted to stress that simply upgrading to something brand new isn't an option here, if I did that I would need to pay anywhere from 10-20k to have the programmer rewrite/update everything. So having the same motherboard is critical.