If anything, by showing those GN benches, you showed that a OC'ed 2600K is far superior to a OC'ed Nehalem in both mins and avg and max, where it counts.
I think you proved horrorshow's point.
I'm actually surprised the 930 at 4ghz is that close to the stock 2600k which typically sits at ~3.6ghz all core turbo depending on the board used. A decent Westmere can hit 4.4-4.6ghz which would close the gap significantly but then a good 2600k can hit 4.8-5ghz.
It really depends on the game and quality settings you use, but on my second rig which has a x5670 @ 4.4ghz and GTX 970, using adjusted settings it can run at 144fps+ 1080p with no issue in Quake Champions and Overwatch. Pretty much always GPU limited.