Thanks for the speedy response guys!

The FLDC is interesting and would be great to crunch although I suspect if I'm going to donate (ie not have a financial incentive) I'd be leaning toward SETI (search for aliens) at the moment as they seem to be getting swamped with the data the telescopes are producing: https://www.engadget.com/2017/05/25/listening-to-starlight-our-ongoing-search-for-alien-intelligenc/

Interesting comment on the AMD graphics cards, I might give the shop a ring, they are listing lots of models on their website.