
Just to make you laugh, my main dev box (the old one) is up and running again, I bought 64 gig of memory to replace the remaining 6 year old modules and had 2 more 16 gig modules so I plonked them in as well and the old box now has 96 gig of new memory. I still have to replace the 2 noisy front fans and work out how to mount the rear radiator but it runs perfectly.
I am currently using its replacement which is close to identical but its a completely new box and it is stunningly quiet. I have most of my old box copied over to it but there is going to be bits and pieces to keep copying as the old box has 6 years of collections in it.
I use a normal 1 gigabit network, a 24 port unmanaged switch near the router and a small 5 port switch in the room where I work. I have a couple of antiques plugged into the network as well but they rarely ever get used, an old i7 box set up with Linux Mint as a dead storage server via a Samba server and I have one XP machine that I keep for a flatbed scanner and a digital microscope.
I am getting tired of fixing computers at the moment, wasted 2 days on the dud Gigabyte board doing messy diagnostics and gave up, rebuilt the Atermiter and have the 4 that I need. 2 x i7 5820k and 2 x Xeon E5-2690v3 12 cores.