Running 4.9Ghz give a lot of heat in the 4770K, so this spec might only be non-throttling on watercooling rigs.
CPU: 4x4.9 Ghz (BCLK 100)
Cache: 4.6 Ghz
Dram: 2.4 Ghz (on my rig - fastest because of better timings)
vCore: 1.385v
vRing: 1.205v
CPU SA: +0,225v
CPU IO A: +0,115v
CPU IO D: +0,115v
Intel Extreme Tuning Utility hwbot bench
4,9GHz ; ~1254 (link)