Hi all

Is there a way of working this out for new graphics cards?  What attributes of the gpu affect the mhash/s rate?  Sorry if this seems like a dumb question but I'm going to buy a few cards this month and want to make sure I make the best buy.  I have never seen any gpu spec from a supplier that states the mhash/s rate.  Any advice will be very appreciated.  I'll post photos of my new miner when its bought and up and running