Different GPU's. Stock vs stock (in which case 780 TI has PLENTY of OC head room)
Just comparing the gigabyte 780's since that's what this was review was about. Unless you're putting a 290X under water, I wouldn't touch the reference cooler....nobody should, it's such a slap to the face for them to release such a crappy cooler; hindering both the experience and the potential of the GPU.
Not sure where you live, but 780 Ti's are no where near that expensive here. It's a $30 difference between the two here.
Also, in regards to your other benchmarks, you gotta keep an eye out on those comparisons.
Metro Last Light is playing with physx: ON
with the 780 Ti.
You have to go to the bottom for the apples to apples comparison, in which the 780 Ti (stock vs stock models) is 9.4% faster.
As for the other games, at their 4k, it is pretty much within margin of error. But those are reference modes (ewww lol)
Sucks that 780 Ti's are so expensive wherever you are.
It'd be nice if we were back to the $500 "tank" prices
I actually think the 290X Gigabyte windforce is a great great card. It's what the original 290X should've been. It's just the current explosion in price puts it in comparison with GPU's that were previously out of the equation