Mojave is good enough for the pciutils access method that uses AppleACPIPlatformExpert.
Looks like you have the latest rom so these PCIe commands are probably not helpful unless you want to reduce the PCIe link width (to test performance with slower slots)
What kind of drives does it contain? Is it RAID 0? What speed are you expecting?
Ok. It says it's connected at 10 Gbps.
You didn't check if it got saved by typingnvram boot-args
OpenCore may be blocking you from changing nvram. In that case, adddebug=0x144
to boot-args in OpenCore config file.
I dunno. Probably not. You didn't show the PCI link speed (in System Information.app) or the max pci link speed (in pcitree output).
What kind of drives does it contain? Is it RAID 0? What speed are you expecting?
I have two HDDs in RAID 0. Seagate IronWolf 7200. I was expecting, via USB-C connection, speeds over 500 R/W but I mostly get 300.
You didn't check if it got saved by typing
nvram boot-args
Do I add this command after the restart?
OpenCore may be blocking you from changing nvram. In that case, add
debug=0x144
to boot-args in OpenCore config file.Do you have info on how to do this?