It should be...I'm running 8.1 on a Samsung 850 EVO 120 GB SSD without a problem on the 5i5RYH.
You have latest BIOS installed before running/loading 8.1?
Returned RAM & SSD to Amazon for refund.
Purchased Crucial MSATA 250Gb SSD and 2X 4gb Crucial RAM
Installed RAM & SSD and removed wireless card.
Installed Windows 7 and added wireless card and 1Tb 2.5" HDD.
OS worked but very sluggish and unstable even after second clean install
Removed HDD & wireless card
Installed Win8.1 pro and added wireless card and 1Tb 2.5" HDD.
NUC now working well & stable.
I just need to learn to like Windows 8.1 now!
A cautionary note, the data lead for the 2.5" drive has been disconnected/reconnected so many times now the 2.5 HDD was not always detected by the BIOS. I think there may be a dodgy connection/broken wire but its currently working.
Thanks to you all for your advice in this and my other thread.
Glad to hear things are better Really enjoying my NUC. Also after being on Win 7 since updating from Vista, 8.1 is a ... challange!
Been running Win 10 develop preview and looks like at least to me, it's shaping up better than 8.1
Well it didn't work well for long!
Just plugged in a USB drive and noticed that the front two USB ports are no longer working. This is a major problem as my wireless mouse and keyboard occupy the two rear ports.
They were definitely working yesterday although a restore made no difference
All ports are enabled in the BIOS.
Unless there is a simple solution I think its time to admit defeat.
Thanks for the reply but I fear the ports are beyond recovery. Even if I set the BIOS to boot from USB first my thumb drive does not even illuminate or get detected.
I have opened a Support Case with Intel & explained the problem. They replied asking what version of BIOS I was using and also asked for my address to send a new NUC.
Does this suggest they are aware of a problem or is it just very good support?