This is a screamer that runs very well.  It has a quad processor, wired and wireless interface, Bluetooth, and will handle two SSD or HD drives (I am using a 1TB SSD - Samsung 970 EVO), 16 GB memory (2 -SODIMM 8 GB modules).  This replaced a Dell Inspiron 530 which was also a quad processor that was memory limited to 3 GB.My first shipment was DOA, but Amazon allowed me to ship it to manufacturer for replacement which did not cost me anything.  I ordered another NUC which came quickly and installation was a snap.  Great purchase.  Oddly, the only time I hear the fan run is sometimes in browsing where CPU utilization gets above 50%, but today's web pages have so much clutter on them that it is not a surprise.  Nothing else seems to register much in CPU utilization.