Hi I own a Intel Pentium D CPU 2.80Ghz running on 2 core processers it is a HP PC m7360n. And Running on Upgrade Version of Windows Vista Home Premium. I have 300watts Powersupply running with Radeon x1600 512MB PRO Version. Then I "want to upgrade to 700watts" Powersupply with out any issues from "300 watts power supply". Is it safe enough to install the powersupply? Also I gotten today Radeon HD 3870 512MB wich is require to upgrade 450 or higher? Is it ok go and head install the power supply? Or can my HD 3870 can or can't? run 300Max which I know is unsafe. :/ I don't want to take any chances. Or not I just goto a local computer store and pay for them to install it.