PCIe vs SATA SSD

I just noticed that my UltraBook has a PCIe SSD port... But the OS is installed on a 512GB SSD... and there's nothing in the PCIe slot.

Would it be worth it in performance to switch to that ?

I'm tempted because I could use the SATA emplacement to install programs...

Or I could use a smaller PCIe drive as a ReadyBoost / Temporary / swap files drive...

This is a 6th gen i5 with 32Gb ram, and a Samsung EVO, used for work... No data in there that needs any backup.

Speed is the goal. losing everything is not a problem. It's mainly used to configure edge devices and get restored every time it starts to go strange.

At the moment there's no doubt that it's fast With W10. But I roll a couple VMs in there to have older software running when needed. and If I could grease the gears a little more I would be happy.

What would you do:

Switch the whole OS and programs to the PCIe drive
or
Use the PCIe Drive has some kind of accelerator.

Thanks @Samuria, I have to open the machine to be sure... Loll, there's no place I can see if it's a Bkey or Mkey socket.

Like opening a 14 inch Oyster.

Since I find no information on the connector, I'll have to look first...What I know: It is mounted in a Standard 7mm Disk emplacement on an adapter. and it's probably a SATA 600 interface so upgrading won't change much...

The Drive I see at the moment is a Standard SATA 600... Specs for my laptop says it can have a Hybrid or a SSd or a PCI SSd ???

The original storage options are:
7 mm HDD (500 GB Hybrid - 5400 rpm / 1 TB - 5400 rpm / 500 GB - 7200 rpm)
SATA OPAL SSD (128 GB / 192 GB / 240 GB / 256 GB / 512 GB)
PCIe SSD (256 GB) <--- is that nvme

At the moment I have a Samsung EVO... and I can see in Hardware that I have an empty NVME port.

So it could be the same port used... Right ? in that case if the board really supports NVME, there's no contest
I should upgrade. But all I see Is PCIe SSD. from the "upgrades" I found they look like they have a m.2 connector.

So I will just confirm that, and order a Evo 970 pro 512Gb if it applies... Hopefully...

The last option in the last looks like an NVMe drive to me. Depending on the number of PCI lanes available to the M.2 slot you still may not see a performance boost, but I do like having at least dual drives in all my computers.

The manual mention PCIE3 x4