I still use GR too,too bad I don't run CC anymore,it really ran well on my 5770s when I had crossfire.
I havent even tried it with my 7970 I've been @ Milkyway and SETI
I do not understand why this hasn't been handled already! If support was added I would start supporting Collatz again too.
I'm running Collatz Conjecture but GridRepublic still isn't listing it ( the Sonntags one!)
http://boinc.thesonntags.com/collatz/ <-----