Listen to what fan boy said:
Just get some diff cooling. If you get Active cooling then put AS5 on it.
Get a better cooler. Ag3 can tell you the Arctic Iceberg Cooler Rev 3 I think it is specifically for ATI cools wonderfully.
Beyond that, I was noticing that the core is higher than the memory. On my card and every other Nvidia card I've seen or had, the memory has always been higher than the core. Is this one of the big differences between Nvidia and ATI? Does anyone know anything about that or am I just crazy?