So I guess that a nvme drive is the only way.
I'm going to grab one of these: https://www.amazon.co.uk/AMPCOM-Adapter-Cooling-Heatsink-Upgarded/dp/B098SHJ37J/
and use with an old Samsung 970 Pro M.2 SSD I have kicking around. Does anyone know if there are any issues using non-standard (ie QNAP standard) PCIe cards?