LSI SAS9300-16i to NVME adapter?

[ace308]

Hello All, 

 

I have gone down a rabbit hole in search of a way to retain dual nvme slots as a cache for my xpenology. 

 

I have a supermicro x11scl-if microATX board with only 1x nvme, 4x sata and 1x pcie x16 slot. Xpenology is installed as a VM on proxmox. 

 

I am looking at the LSI 9211-8i HBA controllers to expand to 4x18tb drives and 2x1tb 2.5inch ssds for cache. This setup should work fine but is there a way to use NVMEs instead of regular SSDs?

 

I got to looking into getting a LSI SAS 9300-16i HBA controller that has 4xSFF-8643 ports. Hypothetically can you connect 4xHDDs to port 1 with a normal SFF-8643 to x4 sata cable, and then on 2 other individual ports (2&3)use  a Mini SAS 3,0 SFF 8643 to U.2 SFF-8639 cable and then a u.2 version ssd (intel p4510 u.2 version) *very expensive option* OR a cheaper option... run NFHK SFF-8639 NVME U.2 to NGFF M.2 M-Key PCIe SSD Adapter with a good NVME drive. 

 

While the gain is very small, this card should have the ability to run the NVMEs at almost full speed correct?

 

Anyway, just an idea for now, looking forward to hearing your perspective.