How do you mine with a GPU? I downloaded the SPH-SGMINER from the link on the website, but I can't get it to work with any pool's. I keep get rejects and hw errors.

*I got it working. Turns out there is a certain version of sgminer and a diff command to add. If anyone is interested, make a batch file with this

sgminer.exe -k quarkcoin -o stratum+tcp://mine-pool.net:3400 -u username -p password -I 16 -g 4 -w 128 --difficulty-multiplier 256