well right now all the 6800U cards are the same save some have custom heatsinks for their card, personaly i'd go with EVGA because their customer support is much better than the other IMO, also their cards tend to have a mild O/C stock, their 6800U is 425/1100 as opposed to the reference 400/1100 (core is dynamic O/C though which from what I read just means it down clocks back to 400 if it's running to hot), their 6800U EE is 450/1200 from the reference 450/1100, and their 5900U back when they made it which is the one I have was at 500/900 from the reference of 450/850.