Installing an Intel 750 SSD in my mac pro 5,1

Dear Apple community,

Yesterday I bought an Intel 750 SSD PCIe card to install in my Mac Pro 5,1 (late 2010). I had a good look at the specs of my mac, which seemed to support PCIe 2.0. Fine for the Intel 750 so it looks.

Today I received the PCIe card and installed it in my Mac Pro. Unfortunately disk utility doesn't recognise it. The device does show in system information in the PCI section: NVM Express Controller, driver installed: No.

I searched the web for possible compatibility issues and some people wrote that the NVM protocol is not supported on older Mac Pros.... BUT Since the Yosemite 10.10.3 update apple has added the NVMe protocol to OSX so I've read on several forums. And there is a "NVMExpress" item in system information on my Mac as well.

Question: should the Intel 750 card work in my Mac Pro now or in the near future? Or do I need to return this awesome superfast SSD and buy a more old fashion device instead?

Hope anyone knows the answer to this! Thanks in advance!

Erik