Stefan Mileschin

"The ECS L337 GANK DRONE Z87H3-A3X was a breeze to overclock. Literally setting the CPU multiplier to 45, setting the CPU and RING voltage, and using the XMP profile for the memory was all that was needed for 4500MHz! The launch BIOS is also the only BIOS available and seems to be perfectly stable. In all of the testing there were no stability issues from the motherboard, the only issue I had was using too low of voltage for this CPU (obviously the ECS motherboard was not at fault here). The eOC program had almost no real features for this motherboard. It would be nice to see a little more features in the BIOS such as profiles and screenshots to aid in overclocking. The limiting factor in overclocking here was definitely the CPU and I feel like the Z87H3-A3X could have gone further. At stock, the motherboard put the CPU in Turbo Mode at 3600 MHz consistently."

http://www.overclockersclub.com/reviews/ecs_z87h3_a3x/