PureOverclock has published a review of the Kingston HyperX 4GB DDR3-1600 memory modules.
A quote from the article:
>> Kingston HyperX 4GB DDR3-1600 Review
We have seen in our past testing that Kingston modules typically offer great performance, and we can tell you right now that this trend has not changed with this set of HyperX 4GB DDR3-1600 sticks on the test bench today. In fact, you will be shocked at how far these Kingston modules can be pushed. Without tipping our hand just yet, let's just say these sticks can run toe-to-toe with industry flagship 2133MHz modules with ease, and at less than half the price. How's that for special? Read on to find out just how far they go.
>> Kingston HyperX 4GB DDR3-1600 Review