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How does GPU w/o need of PSU work...?

Last response: in Graphics & Displays
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July 26, 2012 1:38:03 PM

I'm not sure if I'm asking this right but i'll give it a shot.

I have recently bought a Radeon HD 7750, the reason i bought this is because my computer has a crappy integrated HD 2000 and a 300w psu.

I have researched enough to figure out that the 7750 runs great on a 300w psu because it doesn't need any connection to the PSU it only plug into the motherboard.

But my question is; how does the 7750 get its power than? Obviously from the motherboard, but does this now mean my motherboard is going to be consuming more power from the PSU, or does the motherboard still run on the same amount of power?

Sorry if this is confusing to read, but I'm a learning computer user and have just been really confused on this subject.

Thanks!

More about : gpu psu work

a b U Graphics card
July 26, 2012 1:39:21 PM

it gets its power from the PCIe slot ?
July 26, 2012 1:42:59 PM

gamerkila57 said:
it gets its power from the PCIe slot ?

Thank you for the quick reply, and sorry for my lack of knowledge but isn't the PCIe slot on the motherboard? Basically, if a card can run off of solely the PCIe slot, does this mean that the PCIe slot was made specifically so that it cant go over the max power consumption?
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a b U Graphics card
July 26, 2012 1:51:57 PM
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yes the PCIe slot is on the board and yes it only allows a certain amount but it will never get close to that amount. you can also read this

http://en.wikipedia.org/wiki/PCI_Express#Power
a b U Graphics card
a b V Motherboard
July 26, 2012 1:52:29 PM

The card is designed to run under the maximum power output of the pci express slot, and yes it is on the motherboard.
July 26, 2012 1:53:22 PM

gamerkila57 said:
yes the PCIe slot is on the board and yes it only allows a certain amount but it will never get close to that amount. you can also read this

http://en.wikipedia.org/wiki/PCI_Express#Power

Thank you so much for this answer this is exactly what i was trying to find out!
July 26, 2012 1:53:33 PM

Best answer selected by markhongi.
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