For frigg sake mate, No I'm not trolling, No need to make it into yet another pointless forum argument, I said 5-10%, Anandtech said 15-20%, Whoopdeedoo, It's not important at all in any way shape or form, Move on.
Your posting on an enthusiast forum, so it's to be expected that many do care about numbers. For GPU performance, there's a bit difference between 5% and 20%. Best not to post random numbers if your just plucking them out of thin air, or just move on.