Overclock.net › Forums › Components › Power Supplies › How close to a PSUs max output is safe?
New Posts  All Forums:Forum Nav:

How close to a PSUs max output is safe?

post #1 of 5
Thread Starter 
I have an HX-650 and I'd like to use either the 7950s or 7970s in Crossfire. Depending on what the power draw for the cards ends up being it will probably come within 100W of the 650W the PSU states. Acoustics seem fine with this PSU, I'm wondering if heavy loading can be harmful to it though? Understandably it might not last as long as it would if it were drawing less, but I'm wondering if it has the potential to prematurely kill it? I won't ever be running Furmark or Prime, just gaming and general use.

Also, does 650W refer to max power draw from the wall or max power output to the components?
post #2 of 5
Quote:
Originally Posted by Neroh View Post

I have an HX-650 and I'd like to use either the 7950s or 7970s in Crossfire. Depending on what the power draw for the cards ends up being it will probably come within 100W of the 650W the PSU states. Acoustics seem fine with this PSU, I'm wondering if heavy loading can be harmful to it though? Understandably it might not last as long as it would if it were drawing less, but I'm wondering if it has the potential to prematurely kill it? I won't ever be running Furmark or Prime, just gaming and general use.

Also, does 650W refer to max power draw from the wall or max power output to the components?


650W refers to max output from the PSU to the components. If the PSU efficiency is say 80%, it will draw around 800W from the wall.

 

I would draw max 80% (520W) of the PSU capacity for daily 24/7 to be safe and for the lifespan of the PSU.   

 

ケンジ
(16 items)
 
  
CPUCPUMotherboardGraphics
i7-3960X i7-980X GA-X79-UD7 / GA-X58A-UD9 7970 + 465 
GraphicsRAMRAMHard Drive
2x 6990 + 580 16GB 2133 MHz 24GB 2000 MHz 120GB x 2 RAID0 
Hard DriveHard DriveCoolingCooling
120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
CoolingCoolingOSPower
VID-AR699 EK FB X58A-UD9 Win 7 Ultimate x64 1500W / 1250W+1200W 
  hide details  
Reply
ケンジ
(16 items)
 
  
CPUCPUMotherboardGraphics
i7-3960X i7-980X GA-X79-UD7 / GA-X58A-UD9 7970 + 465 
GraphicsRAMRAMHard Drive
2x 6990 + 580 16GB 2133 MHz 24GB 2000 MHz 120GB x 2 RAID0 
Hard DriveHard DriveCoolingCooling
120GB x 4 RAID0 Raptor 300GB x 2 RAID0 CPU-370 CPU-370 
CoolingCoolingOSPower
VID-AR699 EK FB X58A-UD9 Win 7 Ultimate x64 1500W / 1250W+1200W 
  hide details  
Reply
post #3 of 5
550/650=85% load on the PSU, and your goal should be 80%. I would say it should work perfectly fine. The 650W refers to the max output to the components. Corsair is known to be conservative on these estimates though, seeing how an HX850 can put out almost 1000 watts if it needs to. You should be fine.
Big Mini
(20 items)
 
  
CPUMotherboardGraphicsRAM
Core i7 3770k @ 4.6GHz ASUS Maximus V Gene EVGA GTX 680 16Gb Patriot Viper @ 2133MHz 
Hard DriveHard DriveOptical DriveCooling
256GB Samsung 840 Pro SSD 500GB WD Caviar Black Lite-On Blu-Ray Burner XSPC Raystorm 
CoolingCoolingCoolingCooling
XSPC RS120 Swiftech MCP655-B Swiftech MCR220QP EK 680 Acetal/Copper block 
OSMonitorKeyboardPower
Windows 7 Ultimate 64-bit Shimian QH300 30" (2560x1600), ASUS VS238H-P 23... OCN Ducky with MX Blues Corsair AX760 80+ Platinum 
CaseMouseMouse PadAudio
Fractal Design Arc Mini Cyborg R.A.T. 7 OCZ Behemoth Logitech G35 Headset, 2x KRK Rokit 5 
  hide details  
Reply
Big Mini
(20 items)
 
  
CPUMotherboardGraphicsRAM
Core i7 3770k @ 4.6GHz ASUS Maximus V Gene EVGA GTX 680 16Gb Patriot Viper @ 2133MHz 
Hard DriveHard DriveOptical DriveCooling
256GB Samsung 840 Pro SSD 500GB WD Caviar Black Lite-On Blu-Ray Burner XSPC Raystorm 
CoolingCoolingCoolingCooling
XSPC RS120 Swiftech MCP655-B Swiftech MCR220QP EK 680 Acetal/Copper block 
OSMonitorKeyboardPower
Windows 7 Ultimate 64-bit Shimian QH300 30" (2560x1600), ASUS VS238H-P 23... OCN Ducky with MX Blues Corsair AX760 80+ Platinum 
CaseMouseMouse PadAudio
Fractal Design Arc Mini Cyborg R.A.T. 7 OCZ Behemoth Logitech G35 Headset, 2x KRK Rokit 5 
  hide details  
Reply
post #4 of 5
Thread Starter 
Thanks for the helpful replies. It definitely won't be even close to 24/7, so assuming the power draw of the cards isn't higher than expected I'll give it a go. I'll probably buy a meter to go with them just to make sure all is good.
post #5 of 5
The "max output" is just whatever Corsair decided it was okay to market the unit as (actual max may be higher). This is an HX series unit: it's not going to immediately cry for mommy if you load it up to 650W as the label says, particularly if it's getting cool intake air and not the 50C ambient it's rated for. Don't buy enthusiast-level power supplies and feel like you have to baby them.

For just gaming/general use, you'd probably be well under 650W anyway.
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: Power Supplies
Overclock.net › Forums › Components › Power Supplies › How close to a PSUs max output is safe?