You can submit results with it unlocked to 4 cores. The only 2d benchmark that gains of it is Wprime, which is divided into different rankings depending on the amount of active cores.
Must be a very rare one. I once tried the 7850BE I had on dice, but were too new in OC'ing to know anything about CBB or CB. Probably would have been very hard to manage the CB with dice anyhow.
AMD Ph2 is ok for 3d03, Thuban is nice for 06 and vantage. With a lot of jiggahertz it's decent for 3d05, but for 01/aqua it sucks. Think I got it all right there