The Core i7-6700K was benchmarked with DDR4-2133 memory installed while all Haswell chips were paired with DDR3-2400 memory. The high-speed DDR3 dual-channel memory allowed the Core i7-4790K to achieve a bandwidth of 30GB/s while the Core i7-6700K was limited to just 26.4GB/s.
Despite operating at similar clock speeds, the Core i7-6700K has a distinct advantage over the 4790K when comparing L2 and L3 cache performance. Here the 6700K was 26% faster when comparing L2 performance and 36% faster when comparing L3 cache performance. The 6700K was also able to match the L2 cache performance of the 5960X while crushing its L3 performance.