i preordered video card and i also pick up evga 500 watt power supply to go with it. now my current power supply is 460 watt and how it mounted is fan is facing up to top inner case. my pc is hp envy phoenix so the power supply is mounted on top of the case and not on bottom. anyway if i mount the new 500watt power supply fan facing up would the current gap (1.5mm) be enough or no?