Reduced operating costs can make NVMe a viable option even when budget is a primary consideration. 2.5” Solid State Drives can be tightly packed for extreme density, even in a 1U NVMe server chassis. The Iris NV1220 has up to 20 hot-swap 2.5” 7mm SSD trays accessible from the front panel. This allows for 80 TB of ultra fast raw storage in just one rack unit.
Replacing spinning hard drives with SSDs will certainly allow for considerable power savings. The lack of moving parts provides a built-in reduction in power consumption. Not only that, there are several usable power states, allowing the server to be configured to use the least possible amount of power without impacting performance.