I'm going to go on a limb and state that it isn't me making crap up. This is an overclocked GTX 780:
Fact 1) This is 20% faster than the GTX Titan with a meager mid 1100s overclock.
Fact 2) 290X is
even with Titan in uber mode.
Fact 3) Therefore, this puts GTX 780, when overclocked, 20% faster than the Titan and the 290X.
By all means provide proof with a reputable tech website showing such benchmarks. I have not seen the mythical 290X that is 20% faster than Titan. Based on that fact, the OC'ed 290X is slower than the OC'ed GTX 780.
Furthermore, linus at linustechtips does all reviews with maximum overclocks. In both his 290 and 290X review, the GTX 780 OC outperformed the 290X at maximum overclocks.
So please. If you're not "making crap up" (your phrase, not mine) provide proof. With a reputable tech website. Every website doing maximum overclocks has shown the 780 to outperform the Titan by 15-20%, and the 290X cannot approach this.
The ball is in your court. Show me the 290X that is 15-20% faster than Titan averaged out in 10+ games. And yeah, i'll go ahead and dismiss your "personal" testing in which you just so happen to own a 780 and 290X - like I said, show me a reputable hardware website with similar results of a 290X being 15-20% faster than Titan. TPU is showing the GTX 780 OC to do just that.