If you buy the game today, decide you don't like performance and upgrade the GPU, that's two activations. If you swap the CPU next year or just install a new board/CPU platform altogether that's the third activation. One more hardware change, that's it. Buy the game again.
We've gotten through four video cards in our GPU suite (which spans more than 10 total devices) and have already encountered the dreaded We're Sorry. An error has occurred. Too many computers have accessed this account's version of Mirror's Edge Catalyst.
We're starting to get a little frustrated with EA over this brazen assault on the PC enthusiast culture. The intentions are legitimate: EA hopes to prevent piracy, or something, by attacking its consumers that's normal. Not great, but normal. We can work with that to some extent. Unfortunately, because EA sees everything as a new computer, the limitations are far more severe than totally new system installations. It'd be reasonable to mark a platform upgrade a new CPU & motherboard, maybe a new OS as a new computer. Moving from one video card to the next does not, however, constitute a new computer. We haven't tested if a new OS install (e.g. a re-install after virus infection, which is common) also drains an activation.
http://www.gamersnexus.net/news/2470-mirrors-edge-catalyst-drm-limits-activations-to-4-upgrades