There you have it, at 5.1ghz, the i7k 2600K is faster at rendering than the Core i7 980x at 3.33ghz. Certainly if you overclock the 980x it will outperform the 2600k, but considering the £500 price difference this is incredible.
Next, Super Pi Mod 1.5 @ 5.1ghz, both 1M and 8M calculations. 7.3 seconds and 1 min 26 seconds is an incredible result.
The next time someone says ‘overclocking isn't worth the hassle', show them this page.