💡 Help with T99W175 5G Modem on MikroTik RBM33G – PCIe vs USB?

Hi everyone,

I’m hoping someone can help me clear up some confusion about getting my 5G modem working on a MikroTik board.

I have a T99W175 5G modem (the older version – originally PCIe, but modifiable to work over USB 2.0). It works perfectly in a Fujitsu Futro running OpenWRT (Mini PCIe to key b adapter), but I want to move it to a MikroTik routerboard setup.

I’m considering the RBM33G. I’ve seen success stories of people using this modem via USB, like in this YouTube video: https://www.youtube.com/watch?v=cqAF7eqjJTg&t=536s , and it’s also listed as compatible on MikroTik’s site via the M.2 slot. see here: https://help.mikrotik.com/docs/spaces/ROS/pages/13500447/Peripherals#Peripherals-Cellularmodems

However, I’m unsure about performance. The RBM33G block diagram shows that it supports PCIe lanes, so it shouldn’t need USB for modem use.
RBM33G block diagram: https://cdn.mikrotik.com/web-assets/product_files/RBM33G-esw_231242.png

My main question is:
Can I expect full speed/performance from the T99W175 if I use it through the M.2 (PCIe) slot on the RBM33G? Or am I missing something?

I know there’s a newer USB 3.0 version of this modem, but I already have the older one, and the newer version is out of stock everywhere.

Thanks in advance for any advice!

edit: I have found some one here that did it over USB: http://forum.mikrotik.com/t/rbm33g-5g/150967/72 I guess this is USB 2.0 speeds.. yep USB 2.0: http://forum.mikrotik.com/t/rbm33g-5g/150967/72