The best way to explain it... or express it rather, is by comparing the core clock and memory clocks. Vid cards are not always "THE BEST" by just onboard ram anymore. It's how fast the GPU and the onboard ram runs at.
Think about your computers ram for a sec. You can buy cheap ram, say for 50$ for 1 gig, but the memory timings and speed would suck. Or you can spend 300 $ for a stick of some real FERRARI ram that will make your rig puuurrr like a kitten :wink:
But like I said, go to the manufacturers website and compare the core clocks and mem speeds and you will get your answer. Once you have a handle on that, look at some vid card reviews on games for that card, and it will give you an idea of what "that speed of card" will run at?
If you want a more technical answer, I'm sure some of the techies will be more than happy ta oblige.
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