Overclock.net › Forums › Components › Power Supplies › How bad is it to underutilize a PSU?
New Posts  All Forums:Forum Nav:

How bad is it to underutilize a PSU?

post #1 of 13
Thread Starter 
I'm wondering how bad it is for a PSU to majorly under utilize it.
I have a system that pulls maybe 300 watts and all I have is my Evga 1000 G2

I'm also wanting to buy a PSU for an external GPU for a laptop, and I want to use Evga 1000 G2 or a cheaper ~750watt PSU, I'm wondering if it would even be advisable.
I'd rather buy a PSU for more than just the external GPU and maybe use it in a desktop in the future...
Main Computer
(13 items)
 
  
CPUMotherboardHard DriveHard Drive
i7 - 4770k Asrock Z87 Extreme 4 Crucial MX300 525GB SSD Western Digital 5 Terabyte Hard Drive 
CoolingOSMonitorMonitor
Corsair H100i Windows 10 64-bit (Pro) 27" Qnix 1440p DVI 27" Qnix 1440p Multi-Input 
KeyboardPowerCaseMouse
Logitech G710 Corsair AX760 Phanteks Enthoo Pro Mionix 7000 
Mouse Pad
Mionix 
  hide details  
Reply
Main Computer
(13 items)
 
  
CPUMotherboardHard DriveHard Drive
i7 - 4770k Asrock Z87 Extreme 4 Crucial MX300 525GB SSD Western Digital 5 Terabyte Hard Drive 
CoolingOSMonitorMonitor
Corsair H100i Windows 10 64-bit (Pro) 27" Qnix 1440p DVI 27" Qnix 1440p Multi-Input 
KeyboardPowerCaseMouse
Logitech G710 Corsair AX760 Phanteks Enthoo Pro Mionix 7000 
Mouse Pad
Mionix 
  hide details  
Reply
post #2 of 13
Nothing wrong with putting a PSU under low loads except that it won't operate at peak efficiency.
Dire Wolf
(17 items)
 
  
CPUMotherboardGraphicsRAM
i7 4790K @ 4.9Ghz - 1.35v - Delidded Asus Z97 ROG Maximus VII Hero MSI GTX 1080Ti 11GB Gaming X 16GB Corsair Vengeance Pro 2400mhz 
Hard DriveHard DriveCoolingOS
Samsung SM951 M.2 NVMe - 256GB Samsung 840 EVO - 500GB Noctua NH-D15 Windows 10 Pro 
MonitorKeyboardPowerCase
IIyama 28" 4K B2888UHSU-B1 Corsair Vengeance K90 - MX Red EVGA Supernova 1300W G2 /w Be Quiet! Pure Wings 2 Corsair Carbide 540 Air 
MouseMouse PadAudioAudio
Mionix Naos 8200 Corsair Extended Mouse Mat Creative Soundblaster Z AKG K702 w/ Antlion ModMic 
Other
Logitech Extreme 3D Pro 
  hide details  
Reply
Dire Wolf
(17 items)
 
  
CPUMotherboardGraphicsRAM
i7 4790K @ 4.9Ghz - 1.35v - Delidded Asus Z97 ROG Maximus VII Hero MSI GTX 1080Ti 11GB Gaming X 16GB Corsair Vengeance Pro 2400mhz 
Hard DriveHard DriveCoolingOS
Samsung SM951 M.2 NVMe - 256GB Samsung 840 EVO - 500GB Noctua NH-D15 Windows 10 Pro 
MonitorKeyboardPowerCase
IIyama 28" 4K B2888UHSU-B1 Corsair Vengeance K90 - MX Red EVGA Supernova 1300W G2 /w Be Quiet! Pure Wings 2 Corsair Carbide 540 Air 
MouseMouse PadAudioAudio
Mionix Naos 8200 Corsair Extended Mouse Mat Creative Soundblaster Z AKG K702 w/ Antlion ModMic 
Other
Logitech Extreme 3D Pro 
  hide details  
Reply
post #3 of 13
Quote:
Originally Posted by Kommanche View Post

Nothing wrong with putting a PSU under low loads except that it won't operate at peak efficiency.

Exactly what Kommanche wrote - I'd add that I wouldn't BUY a PSU that over sized but if I had one, I'd use it. As for the new PSU to run a GPU that you may use in a system one day, I'd probably cut that back to a 550 or so to be honest.
    
CPUMotherboardGraphicsRAM
4790K Asus Maximus Gene VII MSI 780ti Gaming Mushkin 
Hard DriveHard DriveOSMonitor
Samsung SM951 M.2  Samsung 840 EVO Windows 10 Dell U3011 
KeyboardPowerCase
WASD w/Cherry Blues and O rings EVGA SuperNOVA 750 G2 CaseLabs S5 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
4790K Asus Maximus Gene VII MSI 780ti Gaming Mushkin 
Hard DriveHard DriveOSMonitor
Samsung SM951 M.2  Samsung 840 EVO Windows 10 Dell U3011 
KeyboardPowerCase
WASD w/Cherry Blues and O rings EVGA SuperNOVA 750 G2 CaseLabs S5 
  hide details  
Reply
post #4 of 13
Thread Starter 
Quote:
Originally Posted by ixsis View Post

Exactly what Kommanche wrote - I'd add that I wouldn't BUY a PSU that over sized but if I had one, I'd use it. As for the new PSU to run a GPU that you may use in a system one day, I'd probably cut that back to a 550 or so to be honest.
750 honestly just seems to be the sweet spot and that's why I used it.
I'm honestly considering a 1050 watt PSU from an OCN member because of the price....
Main Computer
(13 items)
 
  
CPUMotherboardHard DriveHard Drive
i7 - 4770k Asrock Z87 Extreme 4 Crucial MX300 525GB SSD Western Digital 5 Terabyte Hard Drive 
CoolingOSMonitorMonitor
Corsair H100i Windows 10 64-bit (Pro) 27" Qnix 1440p DVI 27" Qnix 1440p Multi-Input 
KeyboardPowerCaseMouse
Logitech G710 Corsair AX760 Phanteks Enthoo Pro Mionix 7000 
Mouse Pad
Mionix 
  hide details  
Reply
Main Computer
(13 items)
 
  
CPUMotherboardHard DriveHard Drive
i7 - 4770k Asrock Z87 Extreme 4 Crucial MX300 525GB SSD Western Digital 5 Terabyte Hard Drive 
CoolingOSMonitorMonitor
Corsair H100i Windows 10 64-bit (Pro) 27" Qnix 1440p DVI 27" Qnix 1440p Multi-Input 
KeyboardPowerCaseMouse
Logitech G710 Corsair AX760 Phanteks Enthoo Pro Mionix 7000 
Mouse Pad
Mionix 
  hide details  
Reply
post #5 of 13
Sweet spot for who? Unless I moved to a 2011 socket, I can't imagine ever needing more than a 650W (and that assumes I'm running SLI) so how is 750 a sweet spot? Price/Watt maybe? A 6700K and current gen GPU aren't even going to break 400w gaming. I'm running a 4970K OC'd and a 780ti and I don't hit 400W. I now have a 550W EVGA G2 in there and never hear it running.
    
CPUMotherboardGraphicsRAM
4790K Asus Maximus Gene VII MSI 780ti Gaming Mushkin 
Hard DriveHard DriveOSMonitor
Samsung SM951 M.2  Samsung 840 EVO Windows 10 Dell U3011 
KeyboardPowerCase
WASD w/Cherry Blues and O rings EVGA SuperNOVA 750 G2 CaseLabs S5 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
4790K Asus Maximus Gene VII MSI 780ti Gaming Mushkin 
Hard DriveHard DriveOSMonitor
Samsung SM951 M.2  Samsung 840 EVO Windows 10 Dell U3011 
KeyboardPowerCase
WASD w/Cherry Blues and O rings EVGA SuperNOVA 750 G2 CaseLabs S5 
  hide details  
Reply
post #6 of 13
Thread Starter 
Quote:
Originally Posted by ixsis View Post

Sweet spot for who? Unless I moved to a 2011 socket, I can't imagine ever needing more than a 650W (and that assumes I'm running SLI) so how is 750 a sweet spot? Price/Watt maybe? A 6700K and current gen GPU aren't even going to break 400w gaming. I'm running a 4970K OC'd and a 780ti and I don't hit 400W. I now have a 550W EVGA G2 in there and never hear it running.
For pricing, Evga 700w for 50$, Corsair 750W at 60$.
I would easily consider the 550-600 if it wasn't for being able to go with 150-200 watts for 5$ more
Main Computer
(13 items)
 
  
CPUMotherboardHard DriveHard Drive
i7 - 4770k Asrock Z87 Extreme 4 Crucial MX300 525GB SSD Western Digital 5 Terabyte Hard Drive 
CoolingOSMonitorMonitor
Corsair H100i Windows 10 64-bit (Pro) 27" Qnix 1440p DVI 27" Qnix 1440p Multi-Input 
KeyboardPowerCaseMouse
Logitech G710 Corsair AX760 Phanteks Enthoo Pro Mionix 7000 
Mouse Pad
Mionix 
  hide details  
Reply
Main Computer
(13 items)
 
  
CPUMotherboardHard DriveHard Drive
i7 - 4770k Asrock Z87 Extreme 4 Crucial MX300 525GB SSD Western Digital 5 Terabyte Hard Drive 
CoolingOSMonitorMonitor
Corsair H100i Windows 10 64-bit (Pro) 27" Qnix 1440p DVI 27" Qnix 1440p Multi-Input 
KeyboardPowerCaseMouse
Logitech G710 Corsair AX760 Phanteks Enthoo Pro Mionix 7000 
Mouse Pad
Mionix 
  hide details  
Reply
post #7 of 13
Quote:
Originally Posted by Skye12977 View Post

For pricing, Evga 700w for 50$, Corsair 750W at 60$.
I would easily consider the 550-600 if it wasn't for being able to go with 150-200 watts for 5$ more
Which EVGA and Corsair cost that little?
Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD60EZRX  WD Red WD80EFZX 8TB  Seagate Ironwolf Pro 10 TB 
Optical DriveCoolingCoolingOS
LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorMonitorKeyboardPower
Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone EMP Roccat Sense Metor Sennheiser HD 598 
AudioAudioAudioAudio
Onkyo TX NR646  Dali Opticon Vokal x2 Dali Opticon 2 x2 Dali Opticon 1 
AudioOtherOther
Dali E12 F Subwoofer CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD60EZRX  WD Red WD80EFZX 8TB  Seagate Ironwolf Pro 10 TB 
Optical DriveCoolingCoolingOS
LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorMonitorKeyboardPower
Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone EMP Roccat Sense Metor Sennheiser HD 598 
AudioAudioAudioAudio
Onkyo TX NR646  Dali Opticon Vokal x2 Dali Opticon 2 x2 Dali Opticon 1 
AudioOtherOther
Dali E12 F Subwoofer CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
post #8 of 13
Thread Starter 
Quote:
Originally Posted by shilka View Post

Which EVGA and Corsair cost that little?
Evga B1 and Corsair CX.
Neither highly rated, B1 seemed decent for what it is and I've not had a problem out of the other CX750's I've bought before.
Main Computer
(13 items)
 
  
CPUMotherboardHard DriveHard Drive
i7 - 4770k Asrock Z87 Extreme 4 Crucial MX300 525GB SSD Western Digital 5 Terabyte Hard Drive 
CoolingOSMonitorMonitor
Corsair H100i Windows 10 64-bit (Pro) 27" Qnix 1440p DVI 27" Qnix 1440p Multi-Input 
KeyboardPowerCaseMouse
Logitech G710 Corsair AX760 Phanteks Enthoo Pro Mionix 7000 
Mouse Pad
Mionix 
  hide details  
Reply
Main Computer
(13 items)
 
  
CPUMotherboardHard DriveHard Drive
i7 - 4770k Asrock Z87 Extreme 4 Crucial MX300 525GB SSD Western Digital 5 Terabyte Hard Drive 
CoolingOSMonitorMonitor
Corsair H100i Windows 10 64-bit (Pro) 27" Qnix 1440p DVI 27" Qnix 1440p Multi-Input 
KeyboardPowerCaseMouse
Logitech G710 Corsair AX760 Phanteks Enthoo Pro Mionix 7000 
Mouse Pad
Mionix 
  hide details  
Reply
post #9 of 13
Quote:
Originally Posted by Skye12977 View Post

Evga B1 and Corsair CX.
Neither highly rated, B1 seemed decent for what it is and I've not had a problem out of the other CX750's I've bought before.
The EVGA SuperNova B1 is a rebranded FSP GLN88 so its voltage regulation sucks, so no its not decent and should be avoided
EVGA SuperNova lineup explained

The CX750 is better but not by much
Why you should not buy a Corsair CX750

Instead of looking at mediocre and crappy 7xx watt units spend the same amount and get a good 5xx watt unit instead
Edited by shilka - 7/7/16 at 6:36am
Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD60EZRX  WD Red WD80EFZX 8TB  Seagate Ironwolf Pro 10 TB 
Optical DriveCoolingCoolingOS
LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorMonitorKeyboardPower
Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone EMP Roccat Sense Metor Sennheiser HD 598 
AudioAudioAudioAudio
Onkyo TX NR646  Dali Opticon Vokal x2 Dali Opticon 2 x2 Dali Opticon 1 
AudioOtherOther
Dali E12 F Subwoofer CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD60EZRX  WD Red WD80EFZX 8TB  Seagate Ironwolf Pro 10 TB 
Optical DriveCoolingCoolingOS
LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorMonitorKeyboardPower
Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone EMP Roccat Sense Metor Sennheiser HD 598 
AudioAudioAudioAudio
Onkyo TX NR646  Dali Opticon Vokal x2 Dali Opticon 2 x2 Dali Opticon 1 
AudioOtherOther
Dali E12 F Subwoofer CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
post #10 of 13
Only reason I have a 1200 watt PUS is becuae i used to run triple SLI and would pull 1000-1100 watts from it. Now with only two cards it usually caps around 800watts.

Like others have said, you wont hurt anything but you will get less efficiancy and usually spend more than you needed too. Thats about it.
 
FreeNAS Box
(10 items)
 
 
CPUMotherboardGraphicsGraphics
Intel 4930K Rampage IV Extreme EVGA Titan X SC EVGA Titan X SC 
RAMHard DriveHard DriveCooling
Dominator Platinum 2133 840 Pro 256gb 840 evo 1tb EK Supremacy EVO 
CoolingCoolingCoolingCooling
Swiftech MPC 655 EK reservoir 250 EK Titan X nickel block EK Titan X nickel block 
OSOSKeyboardPower
Arch Linux Win10 Pro Corsair K95 RGB ax1200i 
CaseMouse
900d Logitech g502 
  hide details  
Reply
 
FreeNAS Box
(10 items)
 
 
CPUMotherboardGraphicsGraphics
Intel 4930K Rampage IV Extreme EVGA Titan X SC EVGA Titan X SC 
RAMHard DriveHard DriveCooling
Dominator Platinum 2133 840 Pro 256gb 840 evo 1tb EK Supremacy EVO 
CoolingCoolingCoolingCooling
Swiftech MPC 655 EK reservoir 250 EK Titan X nickel block EK Titan X nickel block 
OSOSKeyboardPower
Arch Linux Win10 Pro Corsair K95 RGB ax1200i 
CaseMouse
900d Logitech g502 
  hide details  
Reply
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Power Supplies
Overclock.net › Forums › Components › Power Supplies › How bad is it to underutilize a PSU?