Build feedback please

This machine will be used for two main functions.   When it is not cracking hashes it will be hosting a pentest lab VMs (between 20 and 40 VMs), this is why the CPU/RAM is the way it is.  Im curious if there is a known issue with any of this hardware or if there is a better combo of GPU.  Thanks for having a look.

CPU: Intel - Core i9-7900X 3.3GHz 10-Core Processor 
CPU Cooler: Corsair - H105 73.0 CFM Liquid CPU Cooler 
Motherboard: ASRock - X299 Taichi ATX LGA2066 Motherboard
Memory: G.Skill - TridentZ 64Gb (4X16GB) DDR4 3600 F4-3600C17Q-64GTZ
Storage: Samsung - 850 Pro Series 1TB 2.5" Solid State Drive
Storage: Samsung - 850 Pro Series 1TB 2.5" Solid State Drive 
Video Card: EVGA - GeForce GTX 1080 (Founders Edition) 8GB Video Card
Video Card: EVGA - GeForce GTX 1080 (Founders Edition) 8GB Video Card
Video Card: EVGA - GeForce GTX 1080 (Founders Edition) 8GB Video Card
Case: NZXT - Source 530 ATX Full Tower Case 
Power Supply: EVGA - SuperNOVA T2 1600W 80+ Titanium Certified Fully-Modular ATX Power Supply