Possible Tips/Help

Hey, so I have a crap ton of spare 1gb and 2gb GPU's like the GT620 and HD6450. I wanna put some use to all of these but so far I havent managed to find any, which is kind of disappointing because they will just continue to sit around forever unless I find something to do with them.

I would appreciate all tips/help on what to do with these guys, thank you.