I'm not sure any of them have any connectors that are available to you as a user that use PCIe except the m.2 port.
I think you'll have more success asking if a certain piece of hardware works with the nuc you're considering, or checking the compability docs.
Edit: Isn't spread spectrum off by default? I can't recall having ever seen it being enabled in my many years of tinkering with computers.
Thanks for your time to reply to my question.
We are working on a very dense FPGA server for the cloud IBM Research - Zurich, cloudFPGA.
Networking on board uses an Intel FM6000 series Ethernet switch which connects to PCI, spread spectrum off only.
I'm looking for a nice little board which fits into the chassis beside the FPGAs - a NUC looks interesting for our needs. As long UEFI supports to switch PCI spread spectrum off explicitely. Spread spectrum isn't off by default - we have some time consuming experience already.
Therefore again my question: do any of the Intel NUC kits support switching off PCIe spread spectrum?
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Your project sounds really cool but as far as I can tell a nuc isn't for you, I think you will have more luck with itx, m or thin. Considering where you work there ought to be an account manager or two who could help you.
I checked one of my nucs and there is no setting for spread spectrum.
I have to agree with Jema. As I said, the only source of PCIe lanes in the NUC is the four lanes routed to the M.2 connector and this connector is intended to support a M.2 SATA/NVMe SSD or an Optane Memory card. You could request that support be added for general-purpose use of these PCIe lanes. This would be an uphill battle (it could raise validation costs significantly), but you never know. To make such a request, you would need to contact Intel Customer Support directly and have them facilitate contact with the PMEs responsible for this decision-making.