Kind of a waste unless your b50 wont reach 3.8ghz; many do. The 965 is 3.4 ghz stock and the only difference between it and your b50 is 100mhz which is nothing. The 965 won't OC much higher than 3.8 and even if you hit 4.0 its still only a 200mhz difference that you wouldnt notice from a user point of view.
I literally can't get my B50 to overclock much higher. It starts getting very unstable. I'm guessing I got a bad egg. Besides, I was planning on building a computer for my dad so I was just going to give him my old CPU and give myself the new one. He doesn't think overclocking is "safe" so it won't matter to him.