About 18 months ago I bought a “fully-loaded” MacBook Pro from the Apple Refurb store. It’s a 15″ retina mid-2012 model with 16GB RAM, 768GB SSD, and a 2.7 GHz quad-core i7 chip. It kicks ass!
I was wandering around Fry’s Electronics the other day, which I don’t do as much as I used to, and I noticed there are lots of these “4k” monitors starting to appear. Their prices aren’t very good, typically over $500 still. But I was curious how many 4k monitors my “fully-loaded” MacBook Pro can handle.