I don't game, I keep a lot of windows open of pdf's, text files, irc, slaxk, latex docs, text editor, google chrome canary (64bit vs 32), IDE or sublime text etc I am considering buying an older Mac Pro but which graphics card will I need so there will be no window lag when moving things around or minimizing windows and switching between the sic desktops? I plan to use either 2 Dell P2715Q or 2 Dell P2715Q and I'd want to run them at HiDPi 1440p if that matters. In the off chance I want to also run my 27 Thunderbolt display would that work on the cheapest graphics card I need for dual 4k support? Thanks! I was considering buying a 5k iMac and getting one more 4k monitor for it but I assume the graphics card in the 5k iMac will have trouble keeping up with another HiDPi display. So this leaves me with either the nMP which I think is total crap or the cMP from2009-2010 (4,1 or 5,1 models) to run multiple HiDPi screens as well as run my NAS all in one machine, which has a higher WAF (wife approval factor) than my big tall ugly Antec case that holds a 4x4tb RAID array. I also have 4 1TB Crucial SSDs I got refurbed for $180 each. Can these be attached to the PCIe2 slots so I can keep files that must be fast on their and my media can stay on my 4x4tb RAID-Z1 (one disk parity). And, yes, I'll run the RAID arrays on its own VM to avoid any issues with the startup disk and my data thanks to vt-i extensions found in most Xeon CPUs PSA RAID !=backups. I backup onsite and off-site (to AWS) incrementally with rdiff-backup, git and unison. And one more time I do a daily incremental backup to a location in another building just in case this one burns to the ground. I do yet another incremental backup offsite.