I'm thinking of getting a Thermalright NB-1C for my northbridge, ditching the stock NF7-S 2.0 fan, but I don't wanna waste $20 if it won't make a difference. So, how much does an extra .1 volt on the northbridge help with overclocking in general? Stock it's at 1.9, looking to get it to 2.0 volts. Any help = appreciated