Out of these 2 low-med end models which will be better for 1366x768 display? Please post with some valid arguments. Don't tell me HD 7750 or 7770 will be better. I already know that. I need comparision between these 2 only. And please don't show me links of GT 640 2GB DDR3 vs HD 6670 1GB DDR5. Thanks in Advance.