Where is better an NVMe Drive on my MaC PRO 5,1?

[Zak7]

Hi,

I am buying a Mac Studio by November, but I need to hold on to my Mac Pro 2012 5,1 until that time and want to give her more speed... I am using SSD Drives

So I have only one Free PCie Card

Where will give my Pro Tools system more Speed and power?

To put the NVMe Drive on my MacOS or in my Audio(Pro Tools Session Drive)?

I have Pro Tools HDX and will find a way to use a newer MacOS(someone I know can install it using a patch) ..which one do you recommend?

If anyone knows a good PCIe Adapter to NVME that is duaL and that works well for a reasonable price under this circumstance with a Mac Pro 5,1 would appreciate that info

Thanks