I'm in the progress of setting aside money for major upgrade to my existing PC. I currently have an HD4850 1GB in my PC. I have access to a GT 740 SC 2GB card for $20. How much better is the 740 SC? Would it make a decent card until I figure out what card to actually get? I can only find info on the GT740, not the GT 740 SC. Thank you for any help.