Dudes :
Thanks...... Is this fx 6300 bottleneck amd radeon r9 280x....??? And plz suggest me a good mobo but cheap....
Depends on the game.
In most modern multi-threaded games that can use all 6 cores, no bottleneck. I've had an older Phenom II x6 1090T @ 4.0 GHz drive 2 Radeon HD 7950's in crossfire to 95-99% GPU usage in Crysis 3. Was able to max details and go 2x SMAA and kept it around 40-60 FPS. FX are a bit better for gaming and can OC higher. 4.4-4.5 GHz is fairly easy on Air with the FX 6300.
You will only see a bottleneck in older hames that can only use 2-3 cores. But then then you're talking the difference between 90 FPS and 70 FPS, both of which are still very playable, so in essence a non-issue.