Thanks go to Swimtech for pointing this one out:
Adrian's Rojak Pot have a good GPU comparison guide worth a read if you are getting confused with all the cards out there!
"These days, there are so many graphics card models that it has become quite impossible to keep up with the different configurations. Therefore, we decided to compile this guide to provide an easy reference for those who are interested in comparing the specifications of the various desktop GPUs in the market as well as those already obsolescent or obsolete.
We hope it will prove to be a useful reference. We will keep this guide updated regularly so do check back for the latest updates!"
Please find it here