thanx seero, i got it but a new question arise in my mind is the N620 cooler worth upgrading for the stock cooler ? after all your explanation i don't think so.
i will post back when i overclock my cpu.
I brought my HS because it looks good, and replaced the old one because it was noisy. If you do want to know how much better N620 is compare to your stock HS, you will need to first know what your stock HS can do. To do that, you will need to disable the "auto fan speed" in bios or use programs like speedfan, and crank the fan up 100% all the time. Replace it with N620 and you should probably get the same radiating performance with a much lower fan speed. Reviews does give you an idea of how a heatsink performs with respect to stock, but you will probably miss important points like fanspeed, ambient, vcore etc.
It depends on you whether it is a worthy investment. I7-950 itself is a very strong CPU, and OC probably won't give you a lot of actual performance gain. In fact, I7 does OC automatically depend on situations. Whether or not it is worthy is very personal. IMO, many who OC have fun OC and like OC much more than a fast CPU, even at a cost of higher electricity bill, an Artic temp room, or a PC that sounds like a jet engine(no joke). Some OC to justify their investment, i.e. high grade mobo, pillow size HS, 1200Watt PSU etc. I am not you, so I can't say if it is worth it for you. It sounds to me however, that you have already locked your mind to N620, so go for it. Buy something you want for under 100 bucks? Why not?
its a sad truth.
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