(Edit 6/20/17: I finally built a desk for this thing! No more floor computing! I left the original floor setup photo in there so you can have a laugh.)
This is my new SFF gaming rig, built with a focus on silence and performance, in that order. I built this largely because my old gaming PC, Korra, is an ATX mid-tower and it's a pain to lug it back and forth from university.
My performance target for this PC was 1440p@60fps for games like Overwatch, Rise of the Tomb Raider, and Mirror's Edge Catalyst. The GTX 1070 clears that bar for all of these without breaking too much of a sweat, and they look gorgeous on the Dell U2515H monitor.
The NCASE, despite its steep price tag, is a very, very nice case. I'm still not sure it was $230 nice, but I'm quite happy with it. Being a 12-liter case, it can be frustrating at times to build in, but its design attempts to alleviate these issues as best as it can. For example, the back of the case (behind the motherboard tray) is very accessible, and handy for plugging in system panel headers or an M.2 drive in the back. Long graphics cards can also be difficult to fit, but this case has a cutout in the front that lets you slide the card in through there. It's all very ingenious, and to top it off, the case comes with plenty of accessories, like dust filters, wire guards, various brackets, and more. I really wish it had a manual, because it has a lot of unique features that are not found in larger cases and weren't immediately obvious to me.
The star of this build is the Arctic Accelero Xtreme III graphics cooler. This thing is a miracle worker. It's a pain to install and you'll need to read the instructions a few times to make sure you've got it down. It took me about 2 hours to install it, and I did it wrong the first time. But it was worth it. With the stock EVGA ACX 3.0 cooler, my 1070's fans screamed and its temperature would creep above 70C when playing Overwatch at 60fps, which should be a piece of cake for this card. With the Accelero, cooled directly by 2x NF-F12's, the fans only spun to 20%/700RPM, and it was stable at a relatively chilly average of 53C. I think the Accelero Xtreme III is a requirement for building a quiet and cool gaming PC in the NCASE M1.
It's the newest overclockable Core i5. If you're building a new high-end gaming PC, you're probably getting this. It performs as well as everyone says it does.
Noctua makes top-notch coolers and the U9S is no exception. It cools phenomenally well for a 95mm tower, even on a silent fan curve. The renowned SecuFirm 2 mounting system is still awesome: easy to install, very strong and secure, and forward-compatible. And the 6-year warranty is unbeatable. As anyone will tell you, Noctua's reputation is well-deserved.
This board has everything: onboard WiFi/BT, USB Type-C, Thunderbolt 3, six SATA ports, an 8-phase VRM, and all of its fan headers are PWM-capable. The only things I don't like are the ugly I/O shield (solid black would be better), and that there's no front M.2 slot like on the Asus Z270i.
The low-profile heatspreaders are great and not too gaudy, as is often the case. Apart from that, it's RAM and it works fine.
Performance is as good as the best SATA SSD's out there and it sips power. The MX300 is a great bang-for-your-buck drive if you're not willing to spend the premium for an NVMe drive.
The Corsair SF series are still the best SFX power supplies on the market. The SF450 is 80+ Gold certified and just barely misses Platinum. The fan never kicks on in my system. I have to take off a star for two small issues though: first, the stiff and bulky ribbon cables that everyone complains about. This is a significant issue for a power supply made for the small form-factor market. And second, my SF450 exhibits some mild coil whine. It's not a big deal for me and it's barely audible, but something to keep in mind.
The panel in the U2515H is big, bright, and beautiful, and there's no lag so it's great for gaming, despite only being 60Hz. The thin bezel is really nice and the array of inputs is generous: 2 HDMI, 1 DP, and 1 mini-DP. The stand is strong and flexible like every UltraSharp monitor. The integrated USB 3.0 hub is handy too, but I wish it had ports on the side like my U2312HM instead of on the back.