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Windows 7: Does PSU automatically take required input?

30 Jul 2012   #1
easwar2641993

Desk: Win 7 SP1 HP 64BIT & Lap:Win 8.1 Pro 64BIT
 
 
Does PSU automatically take required input?

I have the same PC config as a Core i5 2400 3.1Ghz,Intel DH67BL,4GB RAM DDR3 1333Mhz(2x2GB Corsair,Kingston),1TB Seagate 7200.14 HDD with no add-on cards.For some days I am not going to "play" graphics intensive games like Call Of Duty series,Crysis,Assassin's Creed series etc.So I took graphics card(XFX GT 240 1GB GDDR5) from PC and kept in it's box with electrostatic bag and silica gel and I hope it will remain in good condition for a long time.By the time,I use Intel HD Graphics 2000 Series and I think it will be sufficient for my current activities which include just watching HD movies and playing "chess titans" and "minesweeper".Why I did this becuase I just need to save power.
Now the problem:
Core i5 takes 95W maximum with Intel HD 2000 series.Noway I am going to utilize the full power of it and most of the time,it will operate at half of original frequency i.e 1.5Ghz(approx).So we can say it can utilize maximum 70 or 80W.Now with 1 HDD,1 DVD Writer,oboard LAN-USB-Audio enabled but USB 3.0 is disabled since I have no such device.So.
Processor-80W
Rest- 30W(just saying)
So all together - 110W or maximum 125W if processor is fully used.But my PSU is Antec VP550W series.My question is though the system components take maximum 125W,then PSU will supply the same power?I mean 125W and NOT 550W(70-80% efficiency,so 412-440W approx).Does PSU supply only needed power?
Saving a 70W is really a great thing for me since I use a table fan of 70W daily


My System SpecsSystem Spec
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30 Jul 2012   #2
Dwarf

Windows 8.1 Pro RTM x64
 
 

Yes, a computer PSU will only supply the wattage required at any given point in time. This will go up and down slightly according to the load placed upon it. In addition, the load drawn from the mains supply by the PSU will closely follow that outputted by it, but this will be very slightly higher as the PSU itself also consumes a small amount of power.
My System SpecsSystem Spec
30 Jul 2012   #3
DeaconFrost

Windows 7 Ultimate x64 SP1
 
 

Yes, the PSU is only drawing power that it needs. My question is why? This may be one of the most paranoid power-saving steps I've ever heard of.

The cost difference in running your PC with onboard graphics versus the add-in card is most likely going to be around $1.00 a month or less.

Put the card back in your computer, and enjoy using it. Spend your efforts worrying about something more important!
My System SpecsSystem Spec
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31 Jul 2012   #4
easwar2641993

Desk: Win 7 SP1 HP 64BIT & Lap:Win 8.1 Pro 64BIT
 
 

I just want to know about this.The card is an XFX GT 240 1GB GDDR5 and takes up to 70W maximum.However the card has 3 power management levels -> IDLE(GPU CORE CLOCK:135Mhz,GPU MEMORY CLOCK:135Mhz and GPU SHADER CLOCK:270Mhz)<2D(405Mhz,324Mhz and 810Mhz) <3D(550Mhz,1700Mhz and 1340Mhz).
Does the power consumption depends on the LOAD or these levels?
For eg:If the card is at full frequency i.e full speed at 3D level but the load is minimal such as <10%,then does it mean it consumes 60-70W?
My System SpecsSystem Spec
31 Jul 2012   #5
DeaconFrost

Windows 7 Ultimate x64 SP1
 
 

I'm still not sure why you're putting so much effort into it. You aren't going to be saving a measurable amount of money.

Usually, newer cards have power-saving modes that the card goes into automatically. They draw far less power when you are viewing a webpage as opposed to running a game. The power it draws will depend on many factors, and isn't just some number that can be found by an equation. It will be dynamic. If you really care what your system is pulling, get a UPS, such as an APC that will give you software to monitor the load.
My System SpecsSystem Spec
31 Jul 2012   #6
IIllytch321

Windows 7 Home Premium x64
 
 

Quote   Quote: Originally Posted by easwar2641993 View Post
Does the power consumption depends on the LOAD or these levels?
For eg:If the card is at full frequency i.e full speed at 3D level but the load is minimal such as <10%,then does it mean it consumes 60-70W?
Seems a little picky, but an interesting question - assuming "load" and "those levels" are actually independent variables. As the demand increases the card might just turn on more features and therefore use more power in a simple, moreso linear fashion. Research how the XFX GT 240 "management" works and you'll find out (I just tried to research it on their website and when I clicked "Learn more..." it sent me to an error page, ). Or of course take DeaconFrost's idea to monitor with some kind of software.
My System SpecsSystem Spec
31 Jul 2012   #7
Zepher

Windows 7 Ultimate 64bit
 
 

Quote   Quote: Originally Posted by easwar2641993 View Post
I just want to know about this.The card is an XFX GT 240 1GB GDDR5 and takes up to 70W maximum.However the card has 3 power management levels -> IDLE(GPU CORE CLOCK:135Mhz,GPU MEMORY CLOCK:135Mhz and GPU SHADER CLOCK:270Mhz)<2D(405Mhz,324Mhz and 810Mhz) <3D(550Mhz,1700Mhz and 1340Mhz).
Does the power consumption depends on the LOAD or these levels?
For eg:If the card is at full frequency i.e full speed at 3D level but the load is minimal such as <10%,then does it mean it consumes 60-70W?
Power usage is dependent on both. The max wattage will be at 100% load with the card in 3d mode.
My System SpecsSystem Spec
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 Does PSU automatically take required input?




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