This benchmark shows that when the SuperTalent DDR3-1866 (W1866UX2G8) can reach its rated speed, it performs extremely well.
RightMark Latency
The latency figures for the 1668MHz SuperTalent are simply impossible; the chart shows zero because RightMark actually gave a negative result. I think its safe to say that the 1866 result makes sense; and it is a great result for an Intel based system.