Thanks for the replies. Sorry, just a bit confused, mdalli you stated that "memory bandwidth refers to the size of the "chunk" of data that can be written to or read from the memory per clock cycle." By memory you mean the main system memory i.e RAM? Or the memory on the graphic card?
If you have a dedicated graphics card (and if you care about things like "memory bandwidth", you should), it refers to how fast the GPU accesses the dedicated graphics memory on the graphics card. Don't worry, especially with PCIe x16, the roadblock is not
between the graphics card and the system memory bus.
However, motherboard-integrated graphics solutions almost always share system memory.