Hello, I am making my first custom pc and have so far found a case, motherboard with graphics and sound card and CPU. the case i am buying has a 450W power supply. the CPU i am using is the AMD Phenom II X4 Quad 955 Core 3.2GHz Processor. i am also going to use between 6 and 8 GB of ram and i just wanted to know if the power supply will be enough. also not wanting to sound like an idiot but the case says it supports ATX motherboards and the one i am buying is micro-ATX. will this make any difference at all because i don't think it will but i don't want anything to go wrong with my first build