"The Coolmax V-500 costs only USD 22 at Newegg.com and, therefore, we were very skeptical that it could deliver its labeled wattage, 500 W. Wattage, as we always explain, isn't everything. Let's see the other downsides of using a cheap power supply."
Any major computer upgrade generally requires a full software reinstall too. No so if you heed the advice in the guide to Upgrading a Motherboard without Reinstalling. PCSTATS Tips