I love how there are 3 different, mutually exclusive replies to your question so far.

It's a "normal" socket processor which happens to include graphics-like cores on-die.

You could probably install FreeBSD on it.

No. As far as I aware it's run Linux.

Not sure of the downvotes. If I am following the thread correctly, this is about KNC/KNL?

From a KNC card:

Linux <hostname>-mic0 2.6.38.8+mpss3.4.3 #1 SMP Mon Feb 16 16:08:55 PST 2015 k1om GNU/Linux

From KNL:

Linux <hostname> 3.10.0-229.20.1.el6.x86_64.knl2 #2 SMP Tue Dec 8 22:27:38 MST 2015 x86_64 x86_64 x86_64 GNU/Linux

I was talking about KNC since it's only hardware I ever had access to since Intel sold them 90% off on Amazon.

KNC effectively runs BusyBox with tweaks.

Busybox is not an OS.

If Busybox is not an OS, then neither is GNU.

GNU is not an OS either. GNU/Hurd is. GNU/Linux is.

That is factually correct.

I do not disagree.

I think you should do some reading on what an operating system is.

I think you should do some reading on my comment.