Information temperature "dangerous" for AMD X8 FX 8350 4.0 GHz?

Y normal. Around 70-80 C is already bad for any CPU if im not mistaken

http://lmgtfy.com/?q=AMD+FX+8350+max+temperature

AMD recommends you keep that CPU under 61C. It should throttle down once it reaches 70C.
Having said that, 51C is perfectly fine for gaming.

EDIT: Some documentation. Scroll down to FAQ.

lol I have permanently 80-90°C when I play and 70°C when nothing is open. Im not even using my graphic card because if i do, it reaches over 100°C and my Notebook crashes due to high temperatures...
And you complain about 50°C ? xD

I have an FX-8320 OC-ed to 4.4ghz and my max temp stays under 60C although in the summer it will be a bit higher but I'll down clock a bit then to 4ghz.

Your temperatures are normal. Are you using an aftermarket cooler or the stock one?

My AMD X8 FX 8350 4.0 regular use is 45-48c and 53c to 56c when gaming. Stupid H60 Corsair liquid cooler i got.

Over 65C isn't normal, but not really dangerous. Over 70 is dangerous and will impact on performance. Your computer would start shutting down between 70-75C. I have an old 1075T x6, OC'ed to 3.38GHz and it runs on 50-53C at max I really love AMD in terms of overclock stability.

Max Temps 61° C

http://products.amd.com/en-us/search/CPU/AMD-FX-Series/AMD-FX-8-Core-Black-Edition/FX-8350/92
You're 10 degrees below the max safe temperature for that processor, nothing to worry about.

If you are doing long sessions I wouldn't keep it that close to the 50's for too long. I try and maintain under 40 if I am going to be playing for more then an hour. The damage it does is in increments so you won't exactly know if it's really doing any harm until it's actually too late most of the time. Depending on the fidelity you are accustomed to and the optimization for the game this might not always be possible. Really make sure to airblast your fans every couple of weeks depending on your environment. I would need to try the specific game for myself but your current temperature for what I am looking at seems kind of high.

temps are fine and gaming is stressing the gpu much more than the cpu.

there are three ways to get better temps:
1) third party cpu cooler (noctua if you don't mind the terribile color of the fans).
good thermal paste (arctic silver 5).
my personal preference is negative pressure (dust is a killer for the system, so the less the better). from your case specs: 2 front intakes, rear and 2 top as exhaust.
good third party fans. balance the cfm of the fans (ie. all the fans are the same) and also the cfm-noise ratio (ie. deltas are great but they make the same noise of a plane taking off).

2) aio water cooler but you gotta read some comparisons because some aios are performing worse than a noctua air cooler and check what radiator size you can accomodate in the case and where.

3) custom water loop but I'd advise against it with you case and if you'd known how to do that you wouldn't open this thread ;)

I try with The Witcher 3 and play 25 minutes, my temperature is 71° degrees how possible? And BEFORE i try The Witcher 3, i stay deskopt for 5 minutes and the temperature is 31-34 degrees, how possib
le!?!?!?!

well, for intel, a mobile CPU will go 'til 90, desktop maybe 80. Though these are very high temps, slightly above that may just trigger a safety shutdown.
idk about AMD though

First of all it's a 125W CPU. It's even overclocked, so you should read that as 150W+. It's gonna be hot. It's AMD, AMD is gonna be hot everytime unless you use water cooling.

Praised be Intel.

From both my personal experiences and research into the topic:

As a rule you want to keep as close to the 40s as possible, for the sake of not wearing down parts, but anything below about 63C should be fine (as I recall 145F is the recommended temperature to remain under).
The threshold before you're really doing damage to your computer is 180F (aprox 82C)- you don't want to remain running things in that range- and as I recall, most processors have auto-shut-downs ranging between 180F and 205F, so yeah, not the best of temperatures to be running at.
Running in the 70~C range is demanding, but not immediately problematic- nevertheless, still not advisable.
60s, well, if that's what you can run at, it'll be alright.
While 40s are ideal, I don't think there's any real issues with running in the 50s.

tl;dr version: Running at 51C is fine. If you can get it down into the 40s then that's all the better [as advised above, compressed air and upgrading your cooling system both help], but there's no immediate concern with running in the 50s, especially low 50s.