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Question on Power Supplies

post #1 of 3
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If I get a 1000W and the system only needs 300W at the time, will it still draw 1000W on the electricity bill?

Also, how much do I need for 2 big GPUs and a high end i7 that is mildly overclocked?
PC
(9 items)
 
  
CPUMotherboardGraphicsRAM
4790K 4.6G 1.24v/1.74v, 5.1G 1.35v validation. GA-Z97X-Gaming 7 Tri-X R9 290 1100/1350 +0.012v G.Skill 2400 c10 
CoolingMonitorPowerCase
Noctua NH-D15 24EA53 IPS 76Hz OC EVGA 1000 G2 Phanteks Enthoo Pro 
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SoundMagic E10 
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PC
(9 items)
 
  
CPUMotherboardGraphicsRAM
4790K 4.6G 1.24v/1.74v, 5.1G 1.35v validation. GA-Z97X-Gaming 7 Tri-X R9 290 1100/1350 +0.012v G.Skill 2400 c10 
CoolingMonitorPowerCase
Noctua NH-D15 24EA53 IPS 76Hz OC EVGA 1000 G2 Phanteks Enthoo Pro 
Audio
SoundMagic E10 
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post #2 of 3
Quote:
Originally Posted by fateswarm View Post

If I get a 1000W and the system only needs 300W at the time, will it still draw 1000W on the electricity bill?

Also, how much do I need for 2 big GPUs and a high end i7 that is mildly overclocked?

No it wont draw 1000 watts but the efficiency would be very low as the unit would be below 20% load

750 watts can cover pretty much any system with two video cards and an overclock CPU
Seravee
(23 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming Gigabyte GTX 1070 Xtreme Gaming Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD40EZRX  WD Green WD60EZRX  WD Red WD80EFZX 8TB  
Optical DriveCoolingCoolingOS
LG CH12NS30 5x Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorKeyboardPowerCase
Asus PG279Q Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt Phanteks Enthoo Luxe 
MouseMouse PadAudioAudio
Roccat Kone XTD Laser Roccat Sense Metor Sennheiser HD 598 Onkyo TX NR646  
AudioOtherOther
Harman Kardon HKTS 60 CableMod E series PSU cable set CableMod LED Strips 
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Seravee
(23 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming Gigabyte GTX 1070 Xtreme Gaming Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD40EZRX  WD Green WD60EZRX  WD Red WD80EFZX 8TB  
Optical DriveCoolingCoolingOS
LG CH12NS30 5x Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorKeyboardPowerCase
Asus PG279Q Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt Phanteks Enthoo Luxe 
MouseMouse PadAudioAudio
Roccat Kone XTD Laser Roccat Sense Metor Sennheiser HD 598 Onkyo TX NR646  
AudioOtherOther
Harman Kardon HKTS 60 CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
post #3 of 3
Quote:
Originally Posted by fateswarm View Post

If I get a 1000W and the system only needs 300W at the time, will it still draw 1000W on the electricity bill?

Also, how much do I need for 2 big GPUs and a high end i7 that is mildly overclocked?
It will only draw as much as it needs.

A 850-860W PSU would be fine for your config with some headroom. 750W would also be OK, and I wouldn't recommend going lower than that.
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