Ive recently upgraded my mobo to the same one as you and have been overclocking my FX-8150. Right away after installing the mobo, i put a fan to blow over the VRMs like recomended above. Our proccesors produce ALOT of heat (enough to heat up my living room pretty fast under prime95 stress testing), and that heat comes from the power used that first goes through the VRMs before the proccesor. This causes the VRMs to heat up alot, even with the heatsinks on it. When my VRMs were throttling on my old board (due to it only being a 4 phase VRM) it would throttle down to 25%ish cpu frequency for a couple seconds until temps dropped then it would go back up and repeat the cycle. I never got close to those temps myself on this board with my hotter running 8 core, but it definately helps either way to put a spare fan to blow on them. The VRMs are the heatsinks on the top-left side of the board, to the left of where your cpu cooler is. What i did was ziptie another 120mm fan to the fan that gets mounted on the top-back of my case (through the unused holes you would screw into in fan to hold it to the case). So it is tied to the rear case fan and then the other side of the fan simply rests on my H105 coolers pump (part mounted to the cpu). But ziptieing it to any wires or whatever is there should be fine if its solid and not going to hit the blades on anything. Also, i dont know where you mounted your radiator, but if its is mounted on that back fan spot or anywhere that would possibly block airflow to the VRMs, that will cause issues as heat wouldnt be able to dissipate off of them. Just take a look at where the silver heatsink the the left of the cpu is and try and figure out a way to get as much airflow as possible there. Cooler temps are always better and excess heat will wear things out faster
Now, for overclocking i have recently gotten mine set to 4.45ghz at 1.43v. This is 240 fsb x18.5, which changing the fsb also adjusts the ram, cpu NB, and ht link among other things so you have to be careful. You can overclock by just raising the multiplier though, its much simpler. I also adjusted my LLC (load line calibration) to medium so that under load it only drops to 1.41v. With LLC set to default i needed 1.48v for the same settings because of vdroop. LLC prevents the vcore from dropping as much under load, but youll probably want to google it for a bit so you understand it better. Under small ftt prime95 stress tests my socket and core temps never go above 45*C. With my h105 temps arent the limiting factor for me, but you want to make sure nothing goes above 60*C (some say socket can go to 70*C under prime since it wont get that hot in games, but that pushing it a bit much for me). Some can make much better overclocks with the same chip as me, but not every chip is the same. I could also make it stable higher since my temps are low, but also keep in mind that the more voltage and heat that you put into a chip makes it wear out faster. I didnt want it to wear out so much faster just to be a small bit higher clock. As for performance in games, it depends on the game. My overclocked 7870 gpu is the bottleneck in most games, but my cpu overclock has cleared up some lag in higher settings on WoW and Forza 6:Apex. Saying it doesnt make a difference is not true, but expecting it to bring you to ultra in every game is also unreasonable. These chips arent the best out there for gaming performance, but every bit helps. Just try not to the point where the next 100mhz needs a huge voltage bump to be stable. 100mhz wont make or break anything but your hardware in that case. Just not worth it.
Hope this helps some. This was my first time overclocking a cpu but ive learnt alot doing it and am very happy now that i have things where i want them and stable. Just make sure you test stability as you go with something like prime95. When i was tweaking frequencies/lowering voltages i would do small steps and test for an hour with small ftts in prime. Once i thought i was at the limits where things had passed like that, id run it overnight and make sure it passed that. Then another 10-12 hours under the blend mode to be sure things were good there as well. I did notice however that the lowest voltage to pass prime95 did lower performance vs the next step up. So use something to benchmark as you go and keep track as well. Anyways, sorry for the huge post. Good luck and have fun!
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