Overclockers Club published a review on the Biostar Hi-Fi Z97WE
A quote from the article:
Along that line, overclocking the Hi-Fi Z97WE proved to be fairly easy once I found my way around the BIOS. I finished my overclocking with a clock speed of just over 4.6GHz, which puts the Hi-Fi Z97WE within 50MHz of most of the boards I have tested. It pretty much gave me about as much as I can get with the chip I used. Performance still seemed a little off, but more tuning and digging further into the memory sub timings would likely fix this. As an overclocking motherboard, the 10-phase power circuit seems to do the trick in delivering consistent power to the processor.Biostar Hi-Fi Z97WE Review @ OCC