I stumbled across this awesome site today. You can compare GPU's and see all their tech specs right there in a side by side format. You can even OC the cards and it will change the numbers accordingly, I'm not sure how accurate this feature is though.
Here is a link to the site and a comparison of my first "real" gpu versus what I have now.
http://www.gpureview.com/show_cards.php?card1=134&card2=475
Here is a link to the site and a comparison of my first "real" gpu versus what I have now.
http://www.gpureview.com/show_cards.php?card1=134&card2=475