QUOTE(jaslonely @ May 31 2014, 12:43 PM)

How about the fx 8350? It have more core then xeon and i5.

Having more cores does not mean better performance, especially if your single core works slower then another compatible chip.
PLUS, The problem is cores scale nowhere near 100% for gaming either. So a 8 core chip would not give you a direct advantage on that front either when it's single core performance is already slower than that of a Intel chip.
Example - ARMA 3 core loading on an 8-core AMD CPU:-
http://gamegpu.ru/images/stories/Test_GPU/Action/ARMA%2...
vs an Intel 4-core CPU:-
http://gamegpu.ru/images/stories/Test_GPU/Action/ARMA%2...
Although 8 cores are being used, half are only used as little as 8% per core. On the 4-core Intel it isn't slower because it just means the cores loaded at 8% mean the difference between a 60% loaded core vs a 52% loaded core. It still isn't CPU bottlenecked. This is typical of many games - load 1-2 cores at 80-90% and the others often under 20% due to threading limitations.
Outside of very easily paralleled stuff (eg, video editing), even the most heavily optimised games (eg, Crysis 3) show only 50% difference between a 2C vs 4C but less than 10% 4C vs 8C AMD or 4C vs 6C Intel:-
http://www.techspot.com/review/642-crysis-3-performance...
New games engines may well be written for the new consoles with 8 cores, but each of those 8 cores runs at only half the speed of PC's - 1.75GHz for XBone & 2.0GHz for PS4. 4C->8C also doesn't scale anywhere near the 50% boost seen on some 2C->4C games.
Cross-platform games engines will also continue to be written for the "Lowest Common Denominator" (ie, consoles). You simply aren't going to see a "designed for 4GHz FX-8350 with all 8-cores maxed out" engine, because the same ported engine simply wouldn't run on an 1.75-2.0GHz PS4 or XB1 (whose CPU is only half the speed of desktop PC's even without 1-2 cores being held in reserve for background tasks).
Edit : It's also not a given that next-gen games will be coded for all 8 cores on consoles:-
Even with 8 cores, a number of next-gen games so far are either 1080p/30fps or 720p/60fps (Killzone Shadow Fall, Battlefield 4, etc). Part of that may be due to the GPU, but part may also be that CPU thread scaling isn't efficient enough to make up 30 vs 60fps difference, so it gets pegged at 30fps to avoid screen tearing / more consistent fps on consoles.
(Above information has been compiled from comments on online forums.)
This post has been edited by Sentinel92: May 31 2014, 06:47 PM