It's a Dell XP 8700 64 bit purchased in 2014 running W8.1. It has a 4th generation Intel Core i7-4790 processor; 24 GBs of ram, a 512 GB SSD boot drive, a 2 TB 2nd internal drive and a 4 TB external drive. It has a very nice Dell U2412M monitor with 1920x1200 resolution and a 2 GB Radion video card. I don't intend to render 4K video but to recorder it that way and render to HD, for uploading to Vimeo.
I have no trouble working with HD files including very large .mov files I got after sending out old home movies to a firm which scanned them. I can view the .mov files with Quicktime with no trouble at all.
With 4K, I don't know what the file types best to record on the Sony AX53 I intend to buy soon. But I'll figure that out. I just want to be sure that my Dell will be able to edit 4K files.
Joe
PS: I've seen some videos a friend did in 4K which he rendered to HD and uploaded to YouTube. I was blown away at the quality. He has an much more expensive camcorder but I don't think that's what made the difference- it was recording in 4K and rendering down to HD. A neat trick.