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PCI-Express 4.0 slot won't deliver 300W of power

by on26 August 2016

Still sticking to 75W

It appears that earlier information regarding PCI-Express 4.0 slot and its ability to deliver 300W via slot was somewhat wrong as PCI-SIG has clarified that 300W were only fo certification process but that the maximum power delivery would stick to 75W.

Since the PCI-Express 4.0 is due to get its final specification later this year, we had some information including the fact that it will double the bandwidth from current 8GT/s on the PCI-Express 3.0 to 16GT/s, as well as a rather eyebrow-raising information that it could provide up to 300W of power directly from the slot.

The PCI-SIG reached out to, which got the original story slightly wrong, clarifying that the slot will still provide 75W, while the 225W can be gained from supplemental power connectors. Even if the slot would provide 300W, motherboard makers would have needed a way to deliver that much power to the slot, which means that the motherboard would need additional power connectors and, in the end, it would just somewhat make the cable management a bit easier.

In any case, it appears that PCI-Express 4.0 won't be getting additional power output but rather just double the bandwidth as expected earlier.


Last modified on 26 August 2016
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