The 2 vs . 4 GB VRAM was already explained by umcpasty 666 . Allow me to explain the card heirarchy The first number or numbers , if you ' re looking at the newest 10 series cards is the generation of cards it comes from . Both the 730 and the 750 Ti both start with 7 , so they ' re from the same generation or at least branded as such . The last two numbers are the performance metric for the cards higher numbers are better . Between the 730 and the 750 Ti , the 750 Ti is better . Note that some cards are appended with Ti , this is usually a refresh or slightly better version of the same card from before the 750 Ti is a refreshed and slightly faster version of the 750 . The 760 is better than any of the cards I mentioned before , and the 770 is better than those , and the 780 . etc . Prefix also helps when selecting a card . The GT series of cards are more for media consumption than gaming , whereas the GTX series of cards is gamingcentric . The 730 is always prefixed by GT , where the 750 Ti is always prefixed by GTX .