This might be a redundant question, but: I have a Compaq S5010NX comp with a 250W PSU. I want to upgrade my graphics card from Intergrated 845G to NVidia Geforce FX5500 PCI GPU. Can I use a 300W PSU from a case that I haven't used to upgrade this PSU, or will there be serious problems? If anyone remembers this, I also created a thread about this same 300W PSU going into a DELL Optiplex comp and not working. So, my question is: Will the upgrade be successful, or will I fry my mobo?