Video RAM Clock Speed Formula

What's the formula used to find the vram clock speed?

A stock GTX 780 has 3.0gb of 3.0ghz vram, but in an article I read it said that it has 6.0ghz effective vram speed.

How much of an overclock in mhz would you need to increase it to 7.0ghz?
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  1. Your article is likely as mixed-up as you are.

    GDDR5 RAM uses Quad-Data-Rate signaling so if its data rate is 6GT/s, its actual clock is 1.5GHz - on QDR RAM, clock = data rate / 4.
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