SLI/Crossfire power requirements.

predcon1 · Jul 29, 2016

Does running two cards in SLI or Crossfire mode double the power requirements exactly? Or is it some weird slidey scaley thingy, like how cooking something in a 500w microwave doesn't mean you double the time on the instructions for a 1000w microwave? Example, if one card needs 250w, will two cards of that type need 500w, or will the shared processing bring it down to 450w?

Laxbug · Jul 29, 2016

This would all depend on if your cards are able to run full power. If you get both cards to max out there going to draw the 500w. Keep in mind the manufacturer's power requirements may not be exact. But a rough estimate. For example maybe if the two cards do not have enough VRAM there for they cannot run full power, then you may only draw 400w or 450w. Keep in mind, Vram does not double. This could limit performance and inturn power.

loki1944 · Jul 29, 2016

predcon1 :

With 4770K @stock and 290X CF I saw ~750W power draw; with 5930K @4.5Ghz on 1.29V with 980Ti SLI I hit as high as 900W draw (one time), but average was around the 750W mark.

junkeymonkey · Jul 29, 2016

way I look at it is if the card peak lets say 280w at full load that's 24 amps per card min.. if you figure your total system peak full load amps are say 64 amps you would need a 850w psu @ 70 amps at the single rail 12v+ to cover the 64 amps plus a bit of safety overhead [opinion]

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SLI/Crossfire power requirements.

predcon1

Commendable

junkeymonkey

Laxbug

Reputable

loki1944

Distinguished

junkeymonkey

Polypheme

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