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Quick PSU Question

post #1 of 5
Thread Starter 
Hi,

If I have a 700 watt PSU but my computer only draws 400 watts, does this mean the PSU draws 700 watts from the wall and the extra 300 watts are completely wasted? Or does the psu uses the amount of power asked by the computer components meaning the total amount pulled from the wall varies depending on load?


Thanks.
   
Celapaleis (2013)
(16 items)
 
RAMHard DriveHard DriveKeyboard
x2 8gb GSkill Trident Z 3600 @ 3733 15-14-14-31-2T Samsung 950 Pro 512gb (Undelwalt) WD Red 2tb (Pack Yak II) Kmac 2 (Brown Switch, Gon PCB, Red LED, Clear Top) 
CPUMotherboardGraphicsRAM
i5 6600k Delid @ 4.848/4.848 Asus z170 Hero MSI GTX 980ti @ 1499/8208 1.25v/134% Power 2 x 8gb Gskills Ripjaws V 3131 16-16-16-32 
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Steelseries QcK Mini Blue Yeti Microphone Objective Dac + Amp Sescom AB Switch 
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Krk Rokit 6 G2 x2 Radioshack Ground Loop Isolator (For Rokits) Wooaudio Aluminum Headphone Stand Sennheiser HD 800 
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Celapaleis (2013)
(16 items)
 
RAMHard DriveHard DriveKeyboard
x2 8gb GSkill Trident Z 3600 @ 3733 15-14-14-31-2T Samsung 950 Pro 512gb (Undelwalt) WD Red 2tb (Pack Yak II) Kmac 2 (Brown Switch, Gon PCB, Red LED, Clear Top) 
CPUMotherboardGraphicsRAM
i5 6600k Delid @ 4.848/4.848 Asus z170 Hero MSI GTX 980ti @ 1499/8208 1.25v/134% Power 2 x 8gb Gskills Ripjaws V 3131 16-16-16-32 
Hard DriveHard DriveHard DriveHard Drive
Samsung Pro Series 840 256gb (Celapaleis) 1 TB Samsung Drive (Pack Yak) Samsung Pro Series 850 256gb (Celapaleis Reprise) Phoenix Down (External Backup) 
CoolingCoolingOSMonitor
Noctua D14 Kraken x61 Push-Pull for GPU Windows 10 Pro Catleap 2560x1440 @ 60hz 
KeyboardPowerCaseMouse
CM Storm Trigger Brown Switches EVGA Supernova 1000w P2 Corsair 540 Air Razer Abyssus 
Mouse PadAudioAudioAudio
Steelseries QcK Mini Blue Yeti Microphone Objective Dac + Amp Sescom AB Switch 
AudioAudioAudioAudio
Krk Rokit 6 G2 x2 Radioshack Ground Loop Isolator (For Rokits) Wooaudio Aluminum Headphone Stand Sennheiser HD 800 
AudioOther
Logitech c920 Webcam NZXT Sentry Mix 2 Fan Controller 
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post #2 of 5
It will only pull what it needs, so no need to worry about the bill.

However, with the higher certification ratings it will be more efficient. The efficiency is increased by reducing the amount of power given off as heat.
Edited by MelodicMetro - 7/6/13 at 9:24am
    
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SAMSUNG 840 Series MZ-7TD500BW 2.5" 500GB SSD Pioneer Internal Blu-Ray Burner CORSAIR Hydro Series H60 Windows 8 Professional 
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Filco Ninja Majestouch-2, Tenkeyless, NKR, Tact... Seasonic SS-760XP2 ATX Platinum SilverStone Temjin Series TJ08B-E Black Aluminum ROCCAT Kone XTD 
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ASUS 90-YAA0E0-0UAN00Z 7.1 Channels 24-bit 192K... TP-LINK TL-WDN4800 Dual Band Wireless N900 PCI ... 
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post #3 of 5
What PSU do you have?
Seravee
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Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor Sennheiser HD 598 
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Seravee
(24 items)
 
  
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Samsung 840 Evo WD Green WD30EZRX  WD Green WD40EZRX  WD Green WD60EZRX  
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WD Red WD80EFZX 8TB  LG CH12NS30 5x Noctua NF-A14 FLX Noctua NH-D15 
OSMonitorKeyboardPower
Windows 7 64 Bit Asus PG279Q Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor Sennheiser HD 598 
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post #4 of 5
Quote:
Originally Posted by Darkwizzie View Post

Hi,

If I have a 700 watt PSU but my computer only draws 400 watts, does this mean the PSU draws 700 watts from the wall and the extra 300 watts are completely wasted? Or does the psu uses the amount of power asked by the computer components meaning the total amount pulled from the wall varies depending on load?


Thanks.

It will only pull the 400Watts plus whatever the Efficiency is. So 400W Load and a 80 Titanium Rating means it pulls ~425W from the wall. thumb.gif
 
Folding Skyline
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SkylineServer
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Folding Skyline
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SkylineServer
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Intel i7 5820K Gigabyte X99 SOC Champion Nvidia EVGA "GTX 98" Ti 6GB @ 1452Mhz Kingston HyperX DDR4 3200Mhz (4x4GB) 
Hard DriveHard DriveOptical DriveCooling
Crucial MX100 128GB SATA III SSD (OS) Western Digital 2TB SATA III (Data) LG SATA Light-Scribe DVD+/-RW Drive Corsair H100i Pull x2 
OSMonitorMonitorKeyboard
Windows 10 Pro 64 Bit SP2 Vizio 40" 1920x1080 60/120Hz TV/Monitor Dell SX2210 DVI 1920x1080 Logitech G11 Gaming Keyboard  
PowerCaseMouseMouse Pad
Corsair Professional Series HX850W Rosewill Thor V2 Black/White L.E. Full Tower Case Logitech Ball What Pad? >_< 
Audio
Logitech Z4 2.1 Stereo System  
CPUMotherboardGraphicsRAM
Intel Q6600 @ ~3Ghz MSI 775 Aftermarket Mobo Nvida GTX 770 LE 2GB @ ~1,300+ 2x2GB (4GB) 800Mhz DDR2 RAM 
Hard DriveOptical DriveCoolingOS
Seagate 160GB DVD/CD Writer/Burner Cooler Master 92mm Windows 7 64 Bit Ultimate Basic 
MonitorKeyboardPowerCase
Dell 18" LCD DVI Dell QWERTY Corsair CX500 500W PSU Spartan Series 
MouseMouse PadAudioOther
Dell Laser N/A Internal Speaker 240mm Fan to Cool GPU 
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Intel E5410 2.33Ghz Intel E5410 2.33Ghz Dell T7400 Dual Xeon Nvidia Quadro 290 
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16GB Samsung ECC RAM DDR2 800Mhz Seagate Barrcuda 500GB 7,200RPM (OS) DVD/CD Writer/Burner Dual Intel Xeon Heatsinks w/ 200mm Delta Fan 
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Windows 7 64 Bit Ultimate Dell Precision 18" LCD DVI  Dell Precision 104 QWERTY Dell/Delta 850W Dual Rail PSU 
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Dell Precision T7400 Server Case  Dell Precision Laser N/A Internal Speaker 
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post #5 of 5
Thread Starter 
Quote:
Originally Posted by shilka View Post

What PSU do you have?
I updated my siggy rig with my new power supply.

Thanks to everybody for the replies, I understand now. thumb.gif
   
Celapaleis (2013)
(16 items)
 
RAMHard DriveHard DriveKeyboard
x2 8gb GSkill Trident Z 3600 @ 3733 15-14-14-31-2T Samsung 950 Pro 512gb (Undelwalt) WD Red 2tb (Pack Yak II) Kmac 2 (Brown Switch, Gon PCB, Red LED, Clear Top) 
CPUMotherboardGraphicsRAM
i5 6600k Delid @ 4.848/4.848 Asus z170 Hero MSI GTX 980ti @ 1499/8208 1.25v/134% Power 2 x 8gb Gskills Ripjaws V 3131 16-16-16-32 
Hard DriveHard DriveHard DriveHard Drive
Samsung Pro Series 840 256gb (Celapaleis) 1 TB Samsung Drive (Pack Yak) Samsung Pro Series 850 256gb (Celapaleis Reprise) Phoenix Down (External Backup) 
CoolingCoolingOSMonitor
Noctua D14 Kraken x61 Push-Pull for GPU Windows 10 Pro Catleap 2560x1440 @ 60hz 
KeyboardPowerCaseMouse
CM Storm Trigger Brown Switches EVGA Supernova 1000w P2 Corsair 540 Air Razer Abyssus 
Mouse PadAudioAudioAudio
Steelseries QcK Mini Blue Yeti Microphone Objective Dac + Amp Sescom AB Switch 
AudioAudioAudioAudio
Krk Rokit 6 G2 x2 Radioshack Ground Loop Isolator (For Rokits) Wooaudio Aluminum Headphone Stand Sennheiser HD 800 
AudioOther
Logitech c920 Webcam NZXT Sentry Mix 2 Fan Controller 
  hide details  
Reply
   
Celapaleis (2013)
(16 items)
 
RAMHard DriveHard DriveKeyboard
x2 8gb GSkill Trident Z 3600 @ 3733 15-14-14-31-2T Samsung 950 Pro 512gb (Undelwalt) WD Red 2tb (Pack Yak II) Kmac 2 (Brown Switch, Gon PCB, Red LED, Clear Top) 
CPUMotherboardGraphicsRAM
i5 6600k Delid @ 4.848/4.848 Asus z170 Hero MSI GTX 980ti @ 1499/8208 1.25v/134% Power 2 x 8gb Gskills Ripjaws V 3131 16-16-16-32 
Hard DriveHard DriveHard DriveHard Drive
Samsung Pro Series 840 256gb (Celapaleis) 1 TB Samsung Drive (Pack Yak) Samsung Pro Series 850 256gb (Celapaleis Reprise) Phoenix Down (External Backup) 
CoolingCoolingOSMonitor
Noctua D14 Kraken x61 Push-Pull for GPU Windows 10 Pro Catleap 2560x1440 @ 60hz 
KeyboardPowerCaseMouse
CM Storm Trigger Brown Switches EVGA Supernova 1000w P2 Corsair 540 Air Razer Abyssus 
Mouse PadAudioAudioAudio
Steelseries QcK Mini Blue Yeti Microphone Objective Dac + Amp Sescom AB Switch 
AudioAudioAudioAudio
Krk Rokit 6 G2 x2 Radioshack Ground Loop Isolator (For Rokits) Wooaudio Aluminum Headphone Stand Sennheiser HD 800 
AudioOther
Logitech c920 Webcam NZXT Sentry Mix 2 Fan Controller 
  hide details  
Reply
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