All seven Z97 motherboards used the same DDR3-2400 memory using the XMP profile. Despite the fact that all of them operated the DDR3 memory at the same frequency using the same timings, we did see quite a variation in the results.
The Asus boards produced the best results with the Z97-Pro WiFi/AC hitting 30.6GB/s and the Z97-Deluxe 30.5GB/s. EVGA's Z97 FTW followed with 29.9GB/s while Gigabyte's Z97X-UD5H-BK offered 29.4GB/s.
From there, the MSI Z97 MPower Max AC and Asrock boards dropped down to 27GB/s, around 11% slower than Asus' motherboards.