Hi I have a 680w PSU (thats what it says) but the seller told me it's 450W any way I keep hearing annoying fan noise although my cpu heatsink is running at 2500rpm so I am wondering if getting a better PSU lower the noise and this is it http://www.geeks.com/details.asp?invtid=ES-680-GD
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well that's definately a cheap PSU, and could use an upgrade regardless. But also double check which fan is really making the noise.
Here's a tip: Geeks.com sells awful power supplies most of time. A good power supply is going to set you back probably around $50.
I would open the case and listen to which fan is the loudest in the case.