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Hmm what case, fan setup in case, your room temps and did you put the cooler on wrong? If it was better with the stock cooler and worse with the new cooler you screwed up installing it.
Any other things you need to share before we figure it out?
Did you clean off the heatsink and CPU and apply new thermal paste when you remounted it?
you have some other cooler in the case?if it is not maibe you shoud try something bigger i recomend Cooler Master Fan 120mm Turbine Master Mach1.8 i have one and it is pretty good!