Hello
Yes the 6750 and the 5750 are the same card. its just the 6750 has its clocked turned up a little more. it also has 40 more cores than the 5750. i am currently using a 5670 by HIS. i have not bought a 6670 yet knowing its the same card. all i use are budget gaming cards. the reason i chose the 5670 was cause of the low watts it used during gaming. 60W and at idle its 11W or less. if you can find a good 5750, then i suggest getting it, you cant go wrong. good luck.