I have a plan to buy a graphics card that is compatible with my processor amd a8 7600. I searched on amd website and i found out that amd r7 240 suites the amd dual graphics technology for amd a8 7600. I research also for this amd r7 240 graphics card and i found out that there's a gddr3 and gddr5 r7 240 graphics card. my question is... is the r7 240 2GB 128bit gddr3 better than r7 240 1GB 128bit gddr5? in terms of using autocad and games as well.