You'll lose a good chunk of single threaded performance, you know, the thing that 99% of all games depend on.
Not to mention a 2500k will rape ANY FX CPU when it comes to multi GPU performance..
99% of games? really?
Because all of the latest big hitting titles either don't want hardly any CPU grunt at all, or, want lots of cores. Is this 99% of yours kinda like Marine's 5%?
You know, like pulled from the anus rather than facts? If you want to see what happens in a non CPU dependent game then feel free to stop by my 8320 thread and see how it fares. Min FPS of 49 in Tomb Raider with everything on max. Since when was that not enough?
As for your 'rape' analogy? it's pretty much like the other analogies you've brought up. IE - not very clever, stupid random extreme phrase used to try and scare people out of the truth.
I own two 8320s. Not one, but two. I switched from a Xeon (which equated to a I5 2400) and had plenty of chance to ditch the AMD and go for a better Intel CPU. I sold the Xeon, that pretty much says it all.
Then I had a windfall, and, had plenty of opportunity AGAIN to return to Intel and their expensive CPUs. I chose another 8320 with a top end board.
As for games? I pretty much own every game worth having, dating all the way back to 1998 when the CDROM pretty much became common place. My Steam list and Origin lists are vast, and I can tell you now I could benchmark any one of my hundreds of games and each one would return acceptable playable levels.
These 'rape' sorts of figures you gleefully toss around are a load of crap, mate. I would spend some time reading and learning.