I'm running a 700w power supply so that's never an issue.
I forgot to ask this before. What's the make and Model number of this PSU ? Just make sure it's a decent high quality PSU. A lot of peeps actually SKIMP on the PSU. And most importantly, many aren't even fully aware that WATTAGE number alone means
nothing when it comes to any power supply.
The main concern is the
"quality" of the power, the quality of the components used/CAPS, as well as the total
AMP drawn on the +12V RAIL (output), the efficiency under load, "
ripple suppression", among other factors.The total wattage number of any PSU is
not always really the most important deciding factor, primary concern is the 'quality' of power it produces, and the total capacity of the 12V source etc.
Though how the rails are laid out does not affect that much, i.e. single/multiple +12V rail PSUs. Multi-rail PSU can be mildly better, especially with high wattage unit, but it won't have any impact on your performance, however, it can provide an extra layer of safety in case you get a short circuit. A multi-rail power supply has OCP on all +12V rails, ensuring that your PC components stay alive, if a problem like a short circuit occurs.
A cheap generic/no-name low-end PSU is prone to failure soon, than the units made by reputed brands like SEASONIC, Corsair, BE QUIET, EVGA Supernova, PC Power & Cooling, ANTEC, XFX, Super Flower, OCZ, just to name a few. But even some reputed brands have had some very poor quality units.
The
OEM also matters a lot, instead of the actual PSU brand. I've seen PSUs labelled as 1K watts, but in actual real world scenarios, they can hardly
pull 400 Watts from the wall, even under full load.