Graphics Cards Memory – Bandwidth or Quantity?

Graphics cards with bigger RAMs perform better. This theory is not true. RAMs are employed on the graphics cards to store data and allow for features that are needed to run games. More RAM doesn't always make a difference because the amount of RAM doesn’t have a direct influence on graphics cards performance. But bandwidth of the RAM has.

Clock rate and interface width are the two factors that affect bandwidth of a graphics card RAM. Clock rate is measured in MHz whereas width of an interface is measured in bits. Greater bandwidth means more data transfer at a time which increases the performance. 200 MHz memory transfers data faster than 100 MHz memory and 256 or 128 bit interface is always quicker than 64 bit interface.