Very impressive but is there anything in the real world that would need fast ram like this?

My goodness! This memory is faster than the majority of peoples CPUs, lol.

Extreme RAM OCing is just like any Extreme OCing, very little practical use, other than running benchmarks, you aren't going to be playing games with 4ghz ram for hours a day or anything, nor with anything that need Ln2. Kind of like climbing mount Everest there's nothing up there you need.