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Guru3D.com » News » PCI Express 4.0 Will Deliver 75 Watt over PCIe not 300W

PCI Express 4.0 Will Deliver 75 Watt over PCIe not 300W

by Hilbert Hagedoorn on: 08/25/2016 12:38 PM | source: | 28 comment(s)
PCI Express 4.0 Will Deliver 75 Watt over PCIe not 300W

Last week some news hit the web that detailed specification of the new PCI-Express Gen 4.0 standard that is being developed. It was indicated that the motherboard slot would be capable of delivering 300 Watts through the PCI-Express slot, this is erroneous as it will remain to be 75 Watt, much like it is these days.

The info was shared to tomshardware, who accidentally got it wrong in their assumptions and findings. The PCI Express group contacted them and shared the info that the guys probably retrieved and thus explained wrong information. The 300 Watts is intended for the certification process but the maximum slot power will remain to be 75 Watts:

Update, 8/24/16, 2:06pm PT:PCI-SIG reached out to tell us that the power increase for PCI Express 4.0 will come from secondary connectors and not from the slot directly. They confirmed that we were initially told incorrect information. We have redacted a short passage from our original article that stated what were originally told, which is that the slot would provide at least 300W, and added clarification:

  • PCIe 3.0 max power capabilities: 75W from CEM + 225W from supplemental power connectors = 300W total
  • PCIe 4.0 max power capabilities: TBD

New value “P” = 75W from CEM + (P-75)W from supplemental power connectors.
  

So there you go, graphics cards will still get external power connectors.







« Nvidia Pascal GP100 Die Shot Photo · PCI Express 4.0 Will Deliver 75 Watt over PCIe not 300W · ADATA SU800 SSD Series released »

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Andr3w
Junior Member



Posts: 11
Joined: 2016-08-25

#5326153 Posted on: 08/25/2016 12:41 PM
I was wondering when I saw the news on the web, how will a PCIE slot deliver so much power ?! I turns out that it can't deliver 300 W, lol :P

umeng2002
Senior Member



Posts: 1003
Joined: 2006-09-02

#5326155 Posted on: 08/25/2016 01:00 PM
Shocking! :banana:

dj_aris
Junior Member



Posts: 5
Joined: 2014-05-28

#5326158 Posted on: 08/25/2016 01:06 PM
Would be nice to bump it to 100W, GPUs are getting less and less demanding.

What would be even nicer (and easier) though is to solder connectors in a different location on the GPU boards. Right now they all have them in a rough spot if you care about a clean build. Even if you route cables for miles you still have to plug cables around the middle of your system, that is always bad aesthetically imho. Maybe mobos could even have a small hole at the end of the PCIEx16 slots to route aux cables behind the board?

MainFrame Alpha
Senior Member



Posts: 139
Joined: 2016-05-17

#5326169 Posted on: 08/25/2016 01:27 PM
Thank you for correcting that info Hilbert although an increase in pci-e is welcomed, oh and thanks for the bread crupms..that lightning looks good :nerd:

Cave Waverider
Senior Member



Posts: 1088
Joined: 2010-07-25

#5326174 Posted on: 08/25/2016 01:39 PM
Would be nice to bump it to 100W, GPUs are getting less and less demanding.

What would be even nicer (and easier) though is to solder connectors in a different location on the GPU boards. Right now they all have them in a rough spot if you care about a clean build. Even if you route cables for miles you still have to plug cables around the middle of your system, that is always bad aesthetically imho. Maybe mobos could even have a small hole at the end of the PCIEx16 slots to route aux cables behind the board?Yes. Having the connectors where they are right now might be handy for accessibility without having to remove the card, but having to route the cables away from the back wall and around the card isn't nice for airflow or aesthetics for sure.

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