I have a sapphire 7950.  It came clocked like this:
GPU Clock: 925
Memory Clock: 1250
VDDC: 1250

This card is in a PCI 2.0 X16 express slot
I have 8GB of Ram.

I am using the 13.4 Catalyst Drivers and I think the 2.8 SDK.

I never go over 75 celcius and my PSU is 730W

I am using CGminer 3.01 and running this:
cgminer -o stratum.bitcoin.cz:3333 -u Draxus.worker1 -p C --shaders 1792 --intensity 16 --worksize 256 -g 1

I cannot get it over 470Mh/s....I know some people claim to get up to 600...what am I doing wrong?


Thanks for any help!