Lately I received a primergy rx2530 m1, m2 and m4 (all maxed out with ram and cpus) and wonder if and which of them can be driven as energy efficient as any random diy built. I saw plenty of energy saving options on the Bios (cpu and ram related) but do not know how comparable this is with a consumer setup and which ones are important to be set. I will make my own measurements with truenas and proxmox but wonder if anyone else has those in use. I saw that the rx2540 might be the better option as it can pickup 8 x 3,5 hdd while on the rx2530s the m1 is the only one compatible with with 3,5. Also they have proprietary Hbas. Can those be switched into dumb mode where they allow the os direct access to the connected drives?

Thank you for any suggestions and sharing experiences.