Nvidia vs AMD and also ddr5 vs ddr3

[jackfrost005]

gtx 750 ti 1gb ddr5 vs gtx 750 ti 2gb ddr3 vs r7 250x 1gb ddr5 vs r7 250x 2gb ddr3 vs r7 260x 1gb ddr5 vs r7 260x 2gb ddr3 or 2gb ddr5 version of any of these
for gaming at 1280 x 960 resolution

for games like assassin's creed unity,dead rising 3,grand theft auto v,batman arkham knight,call of duty advanced warfear,battlefield hardline

and also bad optimized game

 

[coozie7]

I can't be sure but I don't think any of those cards are made with GDDR3 memory apart from a few R7 250X but you should avoid any GDDR3 cards anyway, they're slower.
Have a look here: http://www.tomshardware.co.uk/gaming-graphics-card-review,review-32899-7.html