? about NS rating of video memory chips

[Arkaine23]

How does this convert into the memory bandwidth? I'm thinking about video card memory overclocking...

Like 4ns is rated up to 500Mhz(DDR) or so, right? What about 3.8ns? 3.6ns? 3.3ns?

 

[moonunit]

Divide one by access time = clock speed

1/4e-9 = 250e6 (250MHz x2 for DDR)

Do the same for the other speeds and you get
526, 555, 606