Help me understand what the 12V rail is, and how it works in SLI.

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Eduello
Well if we're going by Nvidia's estimate, a single GPU and the rest of the system need about 42A (504W) on the 12V rail, so that's 754W when you add the second GPU. Since running a PSU at is full capacity will rapidly decrease its lifetime, a high quality 850W would be the bare minimum. Change that to 1000W if you want some headroom for overclocking.

Here's a very useful site: http://www.realhardtechx.com/index_archivos/Page362.htm
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Eduello

Eduello

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Mar 2, 2014
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It means that unless you have like 20 hard drives and a 250W CPU, a good quality PSU with 42A on the 12V rail will handle a system with the GTX 780Ti.

Note that Nvidia states the TDP of the card to be 250W, so two of them alone in SLI would only need 500W (or 41.7A) on the 12V rail. This does not include the power consumption of the entire system, only that of the GPUs.
 
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Eduello

Eduello

Judicious
Mar 2, 2014
9,075
0
32,960
Well if we're going by Nvidia's estimate, a single GPU and the rest of the system need about 42A (504W) on the 12V rail, so that's 754W when you add the second GPU. Since running a PSU at is full capacity will rapidly decrease its lifetime, a high quality 850W would be the bare minimum. Change that to 1000W if you want some headroom for overclocking.

Here's a very useful site: http://www.realhardtechx.com/index_archivos/Page362.htm
 
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