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# power supplies

### #1 Favs Posted 07 January 2006 - 11:36 AM

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When looking for power SLI and PFC... what do those mean. Sorry this is the first time i am building a computer in a few years and everything has changed.
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### #2 Jack123 Posted 07 January 2006 - 12:22 PM

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PFC SLI Definitions
7th Jan 2006

Where did you obtain these – [Terms/Acronyms] –

(1) - SLI-Systems – Not sure if this pertains to your question –But here are 2 Links -
http://www.slizone.c...one2_build.html
FAQ- SLI
http://www.slizone.c...one_faq.html#g1

(2) - [PFC]

PFC (power factor correction; also known as power factor controller) is a feature included in some computer and other power supply boxes that reduces the amount of reactive power generated by a computer. Reactive power operates at right angles to true power and energizes the magnetic field. Reactive power has no real value for an electronic device, but electric companies charge for both true and reactive power resulting in unnecessary charges. PFC is a required feature for power supplies shipped to Europe.
In power factor correction, the power factor (represented as "k") is the ratio of true power (kwatts) divided by reactive power (kvar). The power factor value is between 0.0 and 1.00. If the power factor is above 0.8, the device is using power efficiently. A standard power supply has a power factor of 0.70-0.75, and a power supply with PFC has a power factor of 0.95-0.99.
PFC is not used solely for computer power supplies. In other industries, PFC equipment is used to reduce the reactive power produced by fluorescent and high bay lighting, arc furnaces, induction welders, and equipment that uses electrical motors.

[Reference] - http://whatis.techta...i866381,00.html

Jack123

Edited by Jack123, 07 January 2006 - 12:24 PM.

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### #3 jrm20 Posted 07 January 2006 - 12:31 PM

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an sli compatable powersupply is not needed unless you ever plan on getting 2 nvidia video cards in your pc running in sli mode of the same card.

Sli is just 2 video cards running together with a bridge that is a small circuit board. Sli helps on the intensive games with antistrophic and antialiasing on to the max and with the screen resolution to the max.
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### #4 Favs Posted 07 January 2006 - 12:50 PM

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can i use two psu... one for the video card and one for the mother board and such?
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### #5 Jack123 Posted 07 January 2006 - 08:48 PM

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PFC SLI Definitions (#2)
7th Jan 2006

can i use two psu... one for the video card and one for the mother board and such?

Refer to your earlier Post - http://www.geekstogo...ies-t90393.html

warriorscot has the Answer – [No]

Yeah two generic PSUs would make for a lot of sparks if you had a surge, lol, aah just thinking of it is quite funny

Jack123

Edited by Jack123, 07 January 2006 - 08:49 PM.

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