So your GPU Board successfully runs HCC even though people complain that it never works for them? Then please post here. However, rather than fill up this thread, the first person with a working GPU Board that is supposedly no good should create a thread in this GPU Support Forum with the title of the GPU board and then link to it from this thread. The reason is that the GPU thread may pick up lots of posts about software versions, hardware, etc.
Just in case, the official list of excluded GPUs is here though I do not expect trouble with it:
https://secure.worldcommunitygrid.org/help/viewTopic.do?shortName=GPU#610Lawrence