Alas, I use cuda miner as I have nVidia. Sorry I can't help more.
I'd recommend mining using a smart pool rather than mining GLD. I posted in another topic about this but you will make more profit than just mining gold coin. You can probably mine about 30-60 GLD/day if your running close to 24hr/day
With your set up you should probably be able to get ~0.003 BTC/day using the clever miner pool. You can then BUY GLD with that BTC and be able to acquire far more than if you mined it yourself. This will also help improve the value of GLD.
That said, mining GLD means you're also strengthening the network which also helps GLD over all. Up to you in the end. Here is the link.
http://www.clevermining.com