EDIT: I'm not running an X version (R9 290X) but the simple R9 290.
EDIT2: I added a HWInfo screenshot after running that benchmark.
No need for dx diag. I'm running at 1139Mhz Core, 1451Mhz Mem, with a +56mV GPU Voltage.
I'm under water both CPU and GPU (CPU is OC'd at 4.6Mhz from 3.5Mhz...