Tahiti prefers worksize 64 with poclbm.
diff --git a/ocl.c b/ocl.c
index e1a5840..9fcd500 100644
--- a/ocl.c
+++ b/ocl.c
@@ -355,6 +355,8 @@ _clState *initCl(unsigned int gpu, char *name, size_t nameSize)
clState->preferred_vwidth = opt_vectors;
if (opt_worksize && opt_worksize <= (int)clState->max_work_size)
clState->work_size = opt_worksize;
+ else if (strstr(name, "Tahiti"))
+ clState->work_size = 64;
else
clState->work_size = (clState->max_work_size <= 256 ? clState->max_work_size : 256) /
clState->preferred_vwidth;