Rlentini3
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The X299 Dark has the two EPS 8-pin 12V CPU Power Connectors.
Power supplies most commonly have the two outputs labeled "CPU".... One for 24-pin ATX Power Connector and one for a single EPS 8-pin CPU connector. Which outputs on your power supply are you using for these two CPU power connectors on the X299 Dark?
Thanks in advance.
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Bobmitch
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Re: Power supply ports used for X299 EPS CPU Power connection?
2019/12/06 06:23:27
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I have the Corsair HX850i and it has the CPU 24 pin, an eight pin and two more eight pin. You should have no problem connecting the CPU eight pin and another eight pin from your PSU to make the board work correctly...
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Cool GTX
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Re: Power supply ports used for X299 EPS CPU Power connection?
2019/12/06 07:11:18
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Welcome to the EVGA Forums
What PSU do you have ?
Your Not in North America ?
Most Quality 750 W & larger PSU will have 2-8-pin "EPS" / "CPU"
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Rlentini3
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Re: Power supply ports used for X299 EPS CPU Power connection?
2019/12/06 07:22:14
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One is a Corsair HX1000W. It has:
Non-modular: 24 pin Mobo, 8-pin CPU, 2 x 6+2-pin PCI-E
Modular: 6 x SATA, 4 x 6+2-pin PCI-E
I guess my question is, "Is it okay to use 8-pin power supply ports (e.g., those labeled "PCI-E") for this second CPU connection on the X299?" Or should I find a PSU with a second 8-pin CPU power port?
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Cool GTX
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Re: Power supply ports used for X299 EPS CPU Power connection?
2019/12/06 07:27:12
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NO - different places for the 12V & Ground  BAD things will Happen https://forums.evga.com/FindPost/2079568 Your PSU Corsair HX1000W ---> Looks to have 2 dedicated CPU 4-8-pin "EPS"https://www.anandtech.com/show/2513/3 (excerpt) The attached cable harnesses are all sleeved with a black mesh. All of the cables that can be attached to the jacks in the back are connected flat against one another similar to normal IDE cables. Corsair maintains it has two 4/8-pin EPS connectors. One of these is already connected to the fixed harness and one belongs to the loose cables you can attach to the jacks in the front. If this additional EPS connector is used, there will be one less jack available for a PEG connector, which means using triple-SLI will not be possible in this configuration. 
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Cool GTX
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Re: Power supply ports used for X299 EPS CPU Power connection?
2019/12/06 07:38:23
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That PSU is a 10 yr old design - not sure how long you have used it Time to Invest in the Safety & Stability of your New Build ---> I highly recommend buying an new PSU  That PSU can be a spare, sold, hand-me-down or used on your original PC / second computer ...... The PSU is the Most important part of any build (stability) ... yet always seems to be the last thing budgeted for best quality or upgrade
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Rlentini3
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Re: Power supply ports used for X299 EPS CPU Power connection?
2019/12/06 07:43:07
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The Corsair says it has a loose 4/8 Pin EPS cable, but the only ports to plug it into are the ones I described... so I'm not sure how you get a second PSU power source out of that. But anyway...
Thanks all! I have been reminded the pin-outs are different and don't play nice with each other.
And I am probably going to be taking the advice (and have a great excuse) to get a new PSU. That was my real goal! ;)
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Bobmitch
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Re: Power supply ports used for X299 EPS CPU Power connection?
2019/12/06 08:04:14
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I had discussions with Corsair support when I purchased my EVGA X299 FTW K, because of the 2-8 pin CPU connectors. Here is what he had me connect  Based on that...you have connectors you can use  My machine has been flawless for close to two years. Don't think you will have any issues
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Cool GTX
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Re: Power supply ports used for X299 EPS CPU Power connection?
2019/12/06 08:26:44
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Sajin
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Re: Power supply ports used for X299 EPS CPU Power connection?
2019/12/06 08:31:31
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Should be fine to use the blue slots. Mine are connect to cpu/pci-e outputs.
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bob16314
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Re: Power supply ports used for X299 EPS CPU Power connection?
2019/12/07 01:04:03
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Use the hardwired 4+4 pin EPS12V (CPU) connector of the Corsair HX1000W..Then there's a modular 4+4 EPS12V in the cable bag that goes into any of the PSU's blue 8-pin PCI-E.
A second EPS12V doesn't really need connected except in cases of extreme CPU overclocking or where CPU stability is an issue.
However, your mobo manual does say that "For optimal performance with Intel Core X-series i9 Skylake-X processors, BOTH (EPS12V) connectors must be plugged in with CPU power cables."
That's all.
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