I may explore Noctua fans for these servers. Even at low RPMs I can hear the grindy noise of these fans in my kitchen from the basement. Did you get your replacement RAM yet? I'm assuming not since their shipping is slow.
I haven't put the dual processor E5-2670 into the basement yet. It has a clean install of Windows 10 on it now. I need to get AVIsynth and other relevant software on it so I can see how it works with what I built it for. I haven't noticed the noise from my new NAS (in the basement) on the first floor yet. Under just the right conditions I could just barely hear the fans in the PoE HP ProCurve switch (also in the basement) on the first floor. They have more of the grindy noise to them. But I'm talking middle of the night everything turned off not running if you listened really closely you could just faintly hear it. I don't really expect the Intel chassis when idling to be audible from the first floor, but I won't know until I try it. I'm a little more concerned about it while under load. I might end up fine turning the thermal clamps in the .sdr file to make it quiet / inaudible from the first floor. It's nice and cold down there though, so it shouldn't have to spin as much to hit the thermal targets as it did on the first floor.
Natex was out yesterday due to their blizzard. I'm not sure if they're in today or not. They posted something about not having power or internet this morning, so I don't expect they'll ship the RAM anytime soon. That RAM isn't for the S2600CP2J system though. The 8th stick for it should arrive on Saturday.
I got an upgrade of Windows 10 running on the single processor system with the Supermicro board last night. I will clean install it after I put the GTX 650 in it. That will probably be tonight. I need to stuff a graphics card in the system in comes out of though, since it's not quite ready for dismantling. I need to go through what's on it and move some data off it first. I've got one or two cards I can use though, like the HD5570, so it's not a big concern.
I also wouldn't mind a real rack myself. I don't know if they pop up on Craigslist or what. I haven't looked. I have a cheapo telecom rack from Monoprice in the basement hanging from the ceiling joist that I have my switches and patch panels in. It can't hold a PC though.