Difference between Bit and MB?

[KarQuo]

Hello there, I'm currently hunting around for a new computer and being a gamer a graphics card is important to me. I have encountered two sorts of graphics card, ones with MB and one with Bits. Is there any difference in the power of these? EG, is a 256MB graphics card the same power as a 256Bit card?
Thanks for your help in advance.

 

[Dropkickmurphys]

bits arte usually refered to as kilobits, which make up megabytes or megabits. but im not too sure about this

 

[Cromewell]

Not those are refering to different things. The more bits in the bus the faster the memory transfer is (you can think of it like a highway, the more lanes you have the more cars can travel fown it at the same time)

 

[runbird05]

The memory bandwidth (bits) is more of an indicator of performance than the memory size (bytes). You could have as much memory as you want on a card, but it won't matter if the memory can't communicate fast enough with the GPU, so a 128mb, 256 bit card will hands down out perform a 256mb, 128 bit card. A specific example would be comparing a 256mb radeon x300, which will run you a little over $50, and a 128mb GeForce 6800, which will fly in circles around the x300 and cost about $150 more.

If you're looking for a good card for the future though, you should probably get 256 in both categories.