Hey everyone. I'm trying to upgrade an old Dell optiplex 780 MT, trying to get it to run Minecraft at highest settings with atleast 60 fps. The problem however, is that I can't find which version of the pci-e x16 slot it has. Can anyone help me out? Also, could someone tell me which GPU would be good (preferably one which would not be bottlenecked too badly if the PCI slot is too old)? My budget is about 100 dollars... Thanks!