Hmmm. Damn. I'm getting only 360 after raising it to 950mhz and mem to 1200
Are you mining bitcoin? if so drop the memory down to 150 or 300.
And dont use shitty SDK. 2.5 or 2.1 (if possible). You will gain much mhash.
Excuse me, what are those version numbers? I have installed AMD SDK Runtime version 10.0.1084.4:
[2013-05-16 15:51:48] CL Platform 0 vendor: Advanced Micro Devices, Inc.
[2013-05-16 15:51:48] CL Platform 0 name: AMD Accelerated Parallel Processing
[2013-05-16 15:51:48] CL Platform 0 version: OpenCL 1.2 AMD-APP (1084.4)
[2013-05-16 15:51:48] Platform 0 devices: 3