Overclock.net › Forums › Components › Power Supplies › What happens when you use more watts than a PSU has?
New Posts  All Forums:Forum Nav:

What happens when you use more watts than a PSU has?

post #1 of 11
Thread Starter 
What would happen? Pop? Oh and, I've seen stuff of like an Antec PSU giving out 650w (when the specs say 550w) below 50c or something, how would one find out those numbers?
Edit System
(15 items)
 
  
CPUMotherboardGraphicsRAM
830x4 ASUS blah blah blah PRO/USB3 FiveEightFiveZer0 2x4 AMD entertainment edition memory lolwut 
Hard DriveHard DriveOptical DriveCooling
Seagate Barracuda >:] WD Scorpio >:] idk lol 212 
OSMonitorKeyboardPower
xx64en_client_en-us_Retail_Ultimate-_EN_DVD LED 23'' 1080P 5MS no dead pixels :D Goodwill 500w PCP+C 80+<3 
CaseMouseMouse Pad
Antec 300 Was a G500 :*( Steel Series 
  hide details  
Reply
Edit System
(15 items)
 
  
CPUMotherboardGraphicsRAM
830x4 ASUS blah blah blah PRO/USB3 FiveEightFiveZer0 2x4 AMD entertainment edition memory lolwut 
Hard DriveHard DriveOptical DriveCooling
Seagate Barracuda >:] WD Scorpio >:] idk lol 212 
OSMonitorKeyboardPower
xx64en_client_en-us_Retail_Ultimate-_EN_DVD LED 23'' 1080P 5MS no dead pixels :D Goodwill 500w PCP+C 80+<3 
CaseMouseMouse Pad
Antec 300 Was a G500 :*( Steel Series 
  hide details  
Reply
post #2 of 11
A decent power supply wouldn't blow up or anything, it would just fail to provide power to some devices, or just shut off entirely. I've had a PSU that wasn't up to the job, and it wasn't supplying any power to my hard drive, so the system couldn't recognize it. It was just as if there was no hard drive installed. With more modern PCs, it could result in no video on boot (due to a graphics card not getting enough juice to run, of course).

You can usually find the specs for how much power at which temperatures from the manufacturer's website.
HP Pavilion dm1z
(13 items)
 
  
CPUGraphicsRAMHard Drive
Fusion E-350 Radeon HD 6310M 8GB Corsair DDR3 Western Digital Scorpio Black 750GB 
OSMonitor
Windows 7 Home Premium 11.6" 
  hide details  
Reply
HP Pavilion dm1z
(13 items)
 
  
CPUGraphicsRAMHard Drive
Fusion E-350 Radeon HD 6310M 8GB Corsair DDR3 Western Digital Scorpio Black 750GB 
OSMonitor
Windows 7 Home Premium 11.6" 
  hide details  
Reply
post #3 of 11
Many things could happen. It could pop, bang, catch fire, explode, squeal...and sometimes just turn itself off and go quietly into the night.

You just have to test it yourself or look for reviews.
Server
(11 items)
 
  
CPUMotherboardRAMHard Drive
Intel Core i5-3470 ASRock Z77 Extreme6 16 GB G.Skill Sniper DDR3-1600 1TB WD Caviar Black 
Hard DriveCoolingOSCase
4TB WD Caviar Red Cooler Master Hyper 212+ VMWare ESXi NZXT Crafted Series Tempest 410 
OtherOtherOther
LSI 9280-16i4e RAID Card Intel I350 Quad Port Gigabit NIC Intel Pro/1000 PT Dual Port Gigabit NIC 
  hide details  
Reply
Server
(11 items)
 
  
CPUMotherboardRAMHard Drive
Intel Core i5-3470 ASRock Z77 Extreme6 16 GB G.Skill Sniper DDR3-1600 1TB WD Caviar Black 
Hard DriveCoolingOSCase
4TB WD Caviar Red Cooler Master Hyper 212+ VMWare ESXi NZXT Crafted Series Tempest 410 
OtherOtherOther
LSI 9280-16i4e RAID Card Intel I350 Quad Port Gigabit NIC Intel Pro/1000 PT Dual Port Gigabit NIC 
  hide details  
Reply
post #4 of 11
It should just shut off (as most good PSU's do / should), however cheap ones will burn or at least make a loud pop.

Guy I know was all proud of his 4x4 rig with 2x 8800GTX's in SLI however he didn't heed our warnings about using a 500 or 600 watt PSU, and it killed the PSU (burned it right up and smoked a bit), and I think the motherboard died, with some possible damage to the GPU's.
    
CPUMotherboardGraphicsRAM
C2D T7100 1.8 ghz (undervolted) ummm... Dell Intel X3100 2 x 1gb 667mhz 
Hard DriveOptical DriveOSMonitor
Fujitsu 7200 RPM 120gb CD-RW/DVD dual boot Vista business 1440x900 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
C2D T7100 1.8 ghz (undervolted) ummm... Dell Intel X3100 2 x 1gb 667mhz 
Hard DriveOptical DriveOSMonitor
Fujitsu 7200 RPM 120gb CD-RW/DVD dual boot Vista business 1440x900 
  hide details  
Reply
post #5 of 11
You are making me nervous now with ^^this^^ post - is my HX-620 enough for my system?
My System
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7 4771 GA-Z87X-UD3H 2*HD5850 4gb G.Skill Ripjaw + 8gb Corsair XMS3 1600 cl8 
Hard DriveOSMonitorKeyboard
Samsung 840 Pro 256gb | 3*3TB Raid 5 | Corsair F60 Windows 8 x64 *EYEFINITY* Dell 2405FPW + 2*E248WFP Logitech Illuminated 
PowerCaseMouseAudio
Corsair HX-850v2 Lian Li v2010b M$ Basic  Asus Xonar D2X 
AudioAudio
Swan D1080 MK II 08  Shure SRH-440 
  hide details  
Reply
My System
(16 items)
 
  
CPUMotherboardGraphicsRAM
i7 4771 GA-Z87X-UD3H 2*HD5850 4gb G.Skill Ripjaw + 8gb Corsair XMS3 1600 cl8 
Hard DriveOSMonitorKeyboard
Samsung 840 Pro 256gb | 3*3TB Raid 5 | Corsair F60 Windows 8 x64 *EYEFINITY* Dell 2405FPW + 2*E248WFP Logitech Illuminated 
PowerCaseMouseAudio
Corsair HX-850v2 Lian Li v2010b M$ Basic  Asus Xonar D2X 
AudioAudio
Swan D1080 MK II 08  Shure SRH-440 
  hide details  
Reply
post #6 of 11
Quote:
Originally Posted by scottath View Post
You are making me nervous now with ^^this^^ post - is my HX-620 enough for my system?
You are fine. You should even have a bit of room to spare with the Corsair. Your system probably peaks at ~450-500W (idle and normal use a good bit less).
Edited by shinji2k - 5/29/08 at 6:27am
i7 monsta
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.2GHz] [1.325V] ASUS P6T Deluxe V2 2x XFX 5870 [1000/1250] G.Skill 3x2GB 1600MHz 
Hard DriveOSMonitorKeyboard
X25-M 80GB, 320GB WD Scorpio Black Vista x64 2007FP-3007WFP-2007FP-1080p 32" OCN Ducky Brown 
PowerCaseMouse
Silverstone ST85F-P whiteOut G9 
  hide details  
Reply
i7 monsta
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.2GHz] [1.325V] ASUS P6T Deluxe V2 2x XFX 5870 [1000/1250] G.Skill 3x2GB 1600MHz 
Hard DriveOSMonitorKeyboard
X25-M 80GB, 320GB WD Scorpio Black Vista x64 2007FP-3007WFP-2007FP-1080p 32" OCN Ducky Brown 
PowerCaseMouse
Silverstone ST85F-P whiteOut G9 
  hide details  
Reply
post #7 of 11
nevermind
post #8 of 11
Quote:
Originally Posted by scottath View Post
You are making me nervous now with ^^this^^ post - is my HX-620 enough for my system?
Definitely; you're okay.
    
CPUMotherboardGraphicsRAM
Xeon E5645 Asus Rampage II Gene eVGA GTX460 SSC 3x4GB Corsair Dominator PC3-12800 
Hard DriveHard DriveHard DriveOS
Crucial C300 64GB Seagate Momentus XT 750 Western Digital GP 2TB EARS Windows 7 Premium 
MonitorKeyboardPowerCase
Asus VE278Q DSI SMK-88 Seasonic X-660 Lian Li U6B 2011 SE 
MouseMouse Pad
Logitech G500 KAI.g3 HIEN - HARD 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
Xeon E5645 Asus Rampage II Gene eVGA GTX460 SSC 3x4GB Corsair Dominator PC3-12800 
Hard DriveHard DriveHard DriveOS
Crucial C300 64GB Seagate Momentus XT 750 Western Digital GP 2TB EARS Windows 7 Premium 
MonitorKeyboardPowerCase
Asus VE278Q DSI SMK-88 Seasonic X-660 Lian Li U6B 2011 SE 
MouseMouse Pad
Logitech G500 KAI.g3 HIEN - HARD 
  hide details  
Reply
post #9 of 11
Quote:
Originally Posted by redsunx View Post
What would happen? Pop? Oh and, I've seen stuff of like an Antec PSU giving out 650w (when the specs say 550w) below 50c or something, how would one find out those numbers?
Like everyone has said, a properly built psu should shut off when you overload it. OPP (over power protection) should kick in and shut it down before any damage happens. With a cheap psu (or any psu with a malfunction) without the proper safety measures, many things can happen. If the PSU doesn't have properly set OPP (or none at all), it can draw more current from the wall than it can handle. This usually leads to an extravagant show including pops, fireballs, sparks (the fun stuffs) then something on the primary dies. When this happens usually there is no damage to any of the components the psu is hooked up to (but you never know). If the primary side can handle the extra loads, but the secondary can't, the psu will die silently and has a chance of taking components with it by power or voltage surges. There are other protections like OTP (temperature) that should shut the psu down at a certain temp so components inside the PSU don't fail from heat alone and OCP/OVP (current/voltage) set up on the individual power outputs (rails) to shut the psu down before there is a chance to damage a component.

Disclaimer: I've got a headache so I wouldn't be surprised if I mixed something up.
Edited by shinji2k - 5/29/08 at 7:04am
i7 monsta
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.2GHz] [1.325V] ASUS P6T Deluxe V2 2x XFX 5870 [1000/1250] G.Skill 3x2GB 1600MHz 
Hard DriveOSMonitorKeyboard
X25-M 80GB, 320GB WD Scorpio Black Vista x64 2007FP-3007WFP-2007FP-1080p 32" OCN Ducky Brown 
PowerCaseMouse
Silverstone ST85F-P whiteOut G9 
  hide details  
Reply
i7 monsta
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.2GHz] [1.325V] ASUS P6T Deluxe V2 2x XFX 5870 [1000/1250] G.Skill 3x2GB 1600MHz 
Hard DriveOSMonitorKeyboard
X25-M 80GB, 320GB WD Scorpio Black Vista x64 2007FP-3007WFP-2007FP-1080p 32" OCN Ducky Brown 
PowerCaseMouse
Silverstone ST85F-P whiteOut G9 
  hide details  
Reply
post #10 of 11
Puppies die

OPP who's down with OPP
Mighty-iTX
(12 items)
 
One foot in..
(17 items)
 
mATX
(12 items)
 
CPUMotherboardGraphicsRAM
i7-4770K M7-Impact Strix GTX980 Samsung 
Hard DriveCoolingOSMonitor
Crucial M4 256 Glacer 240L W8.1 K272HUL 
KeyboardPowerCaseMouse
Saitek Seasonic X-650 Prodigy MX518 
CPUMotherboardGraphicsGraphics
4770K/45/43 Maximus VI Extreme R290X R290X 
RAMHard DriveHard DriveOptical Drive
Samsung Crucial M4 64GB RAIDR LSSWM 
CoolingOSMonitorKeyboard
Cooler Master Glacer 7 Ultimate 64 SyncMaster Eclipse 
PowerCaseMouseMouse Pad
XFX 1050 BE 600T Silver MX518 Desk 
CPUMotherboardGraphicsRAM
i5-4330 Z87 Gryphon GTX690 G.Skill RipJawsX 
Hard DriveCoolingOSMonitor
WD Blacks Hyper 212 W8.1 ACER 
KeyboardPowerCaseMouse
Logitech Ultra X3 1000w Corsair 230T Orange Razer 
  hide details  
Reply
Mighty-iTX
(12 items)
 
One foot in..
(17 items)
 
mATX
(12 items)
 
CPUMotherboardGraphicsRAM
i7-4770K M7-Impact Strix GTX980 Samsung 
Hard DriveCoolingOSMonitor
Crucial M4 256 Glacer 240L W8.1 K272HUL 
KeyboardPowerCaseMouse
Saitek Seasonic X-650 Prodigy MX518 
CPUMotherboardGraphicsGraphics
4770K/45/43 Maximus VI Extreme R290X R290X 
RAMHard DriveHard DriveOptical Drive
Samsung Crucial M4 64GB RAIDR LSSWM 
CoolingOSMonitorKeyboard
Cooler Master Glacer 7 Ultimate 64 SyncMaster Eclipse 
PowerCaseMouseMouse Pad
XFX 1050 BE 600T Silver MX518 Desk 
CPUMotherboardGraphicsRAM
i5-4330 Z87 Gryphon GTX690 G.Skill RipJawsX 
Hard DriveCoolingOSMonitor
WD Blacks Hyper 212 W8.1 ACER 
KeyboardPowerCaseMouse
Logitech Ultra X3 1000w Corsair 230T Orange Razer 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Power Supplies
Overclock.net › Forums › Components › Power Supplies › What happens when you use more watts than a PSU has?