[aquadrop]

That math stands only if your server has spare CPU utilization.

[rosser]

I disagree. Being IO starved is far more likely, and has a vastly greater impact on the utility and capability of a host, than being CPU starved.

[aquadrop]

Sure IO starving is more likely, but on analytic DB (which is supposed use of showed tech) you probably will do some complex queries with joins, filtering, aggregation etc. That can load CPU pretty well. So you always need to check where the bottleneck is.