My first small form factor (SFF) build.
GPU Cooler - The stock GTX 1080Ti cooler just wasn't cutting it in the small case. Under boost, the GPU was quickly being thermal throttled. Adjusting the fan curve up works, but is just too loud. Like many others, I opted to install an Accelero Xtreme III. Best results were achieved with CPU fans running as intake from the rear and bottom fans exhausting out the bottom. The 1080Ti can now sustain full boost and at reasonable volumes.
Black screen crashes - While stress testing and benchmark-ing, the PC was crashing to black often. If your run into this, disable or uninstall AISuite. Crashing happens when multiple monitoring applications polling for measurements at the same time. Once AISuite was removed, the problem went away.
Fan Control - Argus Monitor is a great replacement for Asus FanXpert. Comes with a host of monitoring options and fan control tools. Most importantly, it doesn't crash when used with HWMonitor or MSI Afterburner.
Save Desk Space - Having side-by-side gaming PCs is important to us, but our current living space doesn't allow for too large a desk, The old mini-ATX was just taking too much room whether it was placed on or beneath the desk.
Travel to LANs - Wanted to have something that could travel around with me easily to local or regional events.
Corsair SF600 80+ Platinum Certified - Note the parts list includes the 'Gold Certified' version of the PSU I originally purchased and returned. Before starting the build, the Platinum version was introduced. For a small premium you get individually sleeved cables that fit very well inside the M1. There are also some reports on the SFF forums that the platinum has an updated fan curve for more silent operation.
RAM for Ryzen - Ended up ordering the G.Skill Trident Z RGB RAM twice. First ordered the GTZR Intel optimized SKU before noticing and then reordering the GTZRX Ryzen optimized version. It probably makes little difference outside synthetic workloads and RAM overclocking.
2 NVMe SSDs - One of these drives migrated from a previous build. The original intent was to install a new NVMe SSD but decided to include both. This reduced the extra cabling needed to connect additional SSDs at the front of the case. I am currently running both drives in software controlled RAID0. One of the drives splits PCI-e lanes with the GPU, but this doesn't seem to impact gaming performance as BUS utilization never saturates.
Potential Next Steps
Accelero Xtreme III - The current configuration of the case with the GTX 1080Ti FE can't sustain OOB boost clocks under synthetic load and default fan curve. Adjust the blower fan curve can get it there, but causes the system to run very loud. This hasn't been too much of an issue in practice, but I may consider replacing the stock cooler with the Accelero heat sink and rely on the Noctua 120mms to exhaust out the bottom of the case.