3DMark
We used 3DMark‘s ‘Fire Strike’ benchmark which is designed to be used on gaming PCs. We opted for the Normal setting, NOT the Extreme mode.
Sandra Processor Arithmetic
Sandra Memory Bandwidth
All three of the system-related benchmarks see ASRock's X99M Killer putting in consistently strong scores. The chart-topping results in 3DMark's Physics test and Sandra's Memory Bandwidth benchmark are clearly aided by the ASRock board's 10% boost in CPU cache frequency.
There's little stopping us reaching similar levels on the competing motherboards with no more than a few clicks.