Hi. I was just wondering, in order to choose the best graphics card is to look at some main features. Such as core clock, memory clock, memory bus and so on. But when i was comparing the GIGABYTE VGA's, i was confused. I was comparing the GTX 550, GTX 560, GTX 570. What i know is at least the core clock, memory clock should be higher as the Series goes up excluding the memory bit and memory. So i was just wondering, any suggestion. The Comparison website is this link. http://www.gigabyte.com/products/comparison/list.aspx?ck=3&pids=3799,3729,3685