It would be a bad idea today to use RAM as a SATA drive. NVMe is much more performant. SAS is available in 12G and 24G. Better would be to utilize DDR3 or bet

It would be a bad idea today to use RAM as a SATA drive. NVMe is much more performant. SAS is available in 12G and 24G. Better would be to utilize DDR3 or better as an NVMe drive or even birfurcated NVMe device. The RAM drive is a good idea too if you have spare RAM or DIMMs. Compressed ZRAM in Linux makes it even better.