In games 670's usually are around 60c to 70c with no overclock, pretty quiet unless temp goes over the 70c then max fan speed kicks in, but remember this is an untouched untweaked no fan profiles set or anything. You can set pretty much anything to your own liking.
The 2gb ram will not be an issue unless your going to buy a massive display or triple monitors. The 670 is more and with the 770 its a bit slower but for £249 its worth it, Now the £219 7950 is cheaper still and a good performer,. So the choice is yours, A slower card for £219 a faster one for £249 or an even faster one for £330
Also the 660ti is faster than the 7950 when the 660ti is overclocked.
The 2gb ram will not be an issue unless your going to buy a massive display or triple monitors. The 670 is more and with the 770 its a bit slower but for £249 its worth it, Now the £219 7950 is cheaper still and a good performer,. So the choice is yours, A slower card for £219 a faster one for £249 or an even faster one for £330
Also the 660ti is faster than the 7950 when the 660ti is overclocked.