Some Intel CPUs have a scalability feature such as i7-4790:

Scalability: 1S Only

There is no explanation about what this is. Could somebody explain it to me?


1 Answer 1


I suspect the Scalability: "1S" means it only supports single socket setups. So you cannot create a system with two sockets and fill only one until you need your system to scale up to handle more load and then to accomplish that, simply add a second processor. You can do that with Xeon processors though, for example E5-2440 v2 has "2S Only".

  • 1
    Does '2S only' mean you can only use the processors in sets of (0 or two). not 1?
    – Gizmo
    Apr 14, 2016 at 18:18
  • @Gizmo Yes, although 0 will probably not work very well... :-) However, the postfix "S" means "Socket". "S2S" would mean scalable 1 or 2 CPUs on a motherboard. See here for details. Aug 17, 2019 at 0:53

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