Is there any difference between SLI ready psu and SLI certified one?
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More aboutready certified
No, they are basically the same, they both support SLI.
Basically in order to be SLI Ready/Certified a PSU has to have a certain amount of power, and of course enough 6pin/8pin connectors to have native support for multiple GPU's without having to use molex adapters. So as long as the PSU has enough wattage, and enough connectors it is ready to support SLI.