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a 700w psu only using 250w

post #1 of 6
Thread Starter 
Hi wondering if you could help me out on this question.

If i had a 700w psu and it was only using 250w most of the time would the psu still pull 700w from my power socket?

Thanks
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
E6420 Asus P5N32-E SLI EVGA 8800GTS Geil PC6400 DDR2 
OSPowerCase
Windows XP Professional SilverStone DA750 antec nine hundred 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
E6420 Asus P5N32-E SLI EVGA 8800GTS Geil PC6400 DDR2 
OSPowerCase
Windows XP Professional SilverStone DA750 antec nine hundred 
  hide details  
Reply
post #2 of 6
No. It only pulls what is needed.
Once again...
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.28GHz, HT] Asus P6T + Broadcom NetXtreme II VisionTek HD5850 [900/1200] + Galaxy GT240 2x4GB G.Skill Ripjaw X [1632 MHz] 
Hard DriveOSMonitorKeyboard
Intel X25-M 160GB + 3xRAID0 500GB 7200.12 Window 7 Pro 64 Acer H243H + Samsung 226BW XARMOR-U9BL  
PowerCaseMouseMouse Pad
Antec Truepower New 750W Li Lian PC-V2100 [10x120mm fans] Logitech G9 X-Trac Pro 
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Once again...
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 920 [4.28GHz, HT] Asus P6T + Broadcom NetXtreme II VisionTek HD5850 [900/1200] + Galaxy GT240 2x4GB G.Skill Ripjaw X [1632 MHz] 
Hard DriveOSMonitorKeyboard
Intel X25-M 160GB + 3xRAID0 500GB 7200.12 Window 7 Pro 64 Acer H243H + Samsung 226BW XARMOR-U9BL  
PowerCaseMouseMouse Pad
Antec Truepower New 750W Li Lian PC-V2100 [10x120mm fans] Logitech G9 X-Trac Pro 
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post #3 of 6
Nope.

It'll pull 250W, *add* (need a better word) the efficiency (as its so low probably say 90%) = 250 * 1.1 = 275W
Main Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel C2D E6700 Asus P5KPL-AM mATX Palit GTS250 2 x 2GB OCZ PC2-8500 
Hard DriveOptical DriveOSMonitor
Western Digital 500GB Pioneer DVD-RW Windows 7 Ultimate 64-bit Viewsonic VA2213w 
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Logitech Media Keyboard Deluxe 750W Thermaltake Toughpower Antec NSW4400 Logitech MX510 
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Main Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel C2D E6700 Asus P5KPL-AM mATX Palit GTS250 2 x 2GB OCZ PC2-8500 
Hard DriveOptical DriveOSMonitor
Western Digital 500GB Pioneer DVD-RW Windows 7 Ultimate 64-bit Viewsonic VA2213w 
KeyboardPowerCaseMouse
Logitech Media Keyboard Deluxe 750W Thermaltake Toughpower Antec NSW4400 Logitech MX510 
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post #4 of 6
lol.. that would be terrible if PSUs pulled the full amount all the time, think about the wasted energy and the electricity bill!

Your PSU runs at max efficiency at around 30 - 70% load, anything less then that, and there's a lot of loss since the architecture of the PSU burns at least a fixed amount of power (and the bigger the PSU, the more that minimum amount is), and any higher than the midrange of load will generate a lot of heat on the wires inside it and a lot will be lost to heat.
post #5 of 6
Thread Starter 
Great, thanks for the post everybody. I was thinking of getting a Sliverstone DA750 for my e6420 with a 8800gts.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
E6420 Asus P5N32-E SLI EVGA 8800GTS Geil PC6400 DDR2 
OSPowerCase
Windows XP Professional SilverStone DA750 antec nine hundred 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
E6420 Asus P5N32-E SLI EVGA 8800GTS Geil PC6400 DDR2 
OSPowerCase
Windows XP Professional SilverStone DA750 antec nine hundred 
  hide details  
Reply
post #6 of 6
That'll provide more then enough power, you can even SLI it later if you want to.
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