is this ram any good?

The ram is speed binned for those speeds.
It will overclock but how much varies on the type of ICs it uses, a question 8 Pack can answer better than me.

Whether your system runs it is down to processor mainly, and it's a bit of a lottery as not all memory controllers are equal but chances are that it will be fine.
 
Speed binning is a process whereby all components are tested to see what they are capable of at a predetermined set of voltages, temperatures etc.

Therefore higher speed binned parts are sold at a premium as with all components, a batch of ram ICs will not all perform identically.

I personally don't have any experience with Haswell buy as far as I'm aware they generally have strong IMCs so 2666mhz ram will fine.
 
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