Power Suppy Question Tags: Power Supplies Power Components Last response: November 12, 2012 8:24 PM in Components Share Stylo November 12, 2012 6:25:42 PM Hey all. Does a 700W PSU and a 500W PSU same brand in the exact same system draw the same amount of power/energy use? Basically I want to upgraded my PSU first to a 700W and want to know if I put it in my current system will it become less energy efficient. More about : power suppy question Z1NONLY a b ) Power supply November 12, 2012 7:03:03 PM PSU's pull only what is demanded from them plus whatever they need to supply that power. The more efficient the PSU the less power it needs to do it's job. So a newer, mor efficient 700w PSU could end up pulling less power from the wall outlet than an older, less efficient PSU. TheBigTroll a b ) Power supply November 12, 2012 8:24:05 PM if you upgraded to a low end 700w vs a high end 500w, you would be losing more than what you will be gaining anyways, efficiency of the unit is determined by how much power you are drawing. power supplies tend to be most efficient when the load is around 40-60% of the rated output of the unit therefore for a 500w, assuming it can output 500w on the 12v rail, will be most efficient when the system is drawing 250w for a 700w, assuming it can supply 700w on the 12v rail, it would be most efficient at around 350w. if you are not hitting those marks, efficiency will drop, therefore consuming a bit more power Can't find your answer ? Ask ! Publish Related resources Power Suppy question Forum Question re power suppy Forum Power suppy question Forum Silly Case/ Power Suppy Question Forum power suppy connection question Forum Power suppy / mainboard question Forum Uncertainty of power suppy and new graphic card Forum Case Power Suppy recommendations (i52500k/Z68XP-UD3/GTX450) Forum Power Suppy ? I'm a PC noob. Forum Power Suppy Dips to 2.28V When Gaming Forum buying new power suppy & mobo (conecting?) Forum Power Suppy Recommendation Forum Power Suppy the problem..? Forum POWER SUPPY AND MOTHERBOARDS FOR DELL OPTIPLEX Forum Replacing a power suppy Forum 500w PSU Forum What power supply would be needed to run a radeon 6970 and an 8970? Forum First PC Build! How much suggested power? Forum [Solved] How much power do I need? Forum [Solved] Power supply fan stops spinning Forum More resources Read discussions in other Components categories Power supplies Sound cards NICs Akasa Antec Cooler Master Cougar DeepCool Enermax !