GeForce 210 UEFI?

Hello!

I'm trying to run HS on a Dell inspiron 660s, but the iGPU is not compatible (Intel HD2500), and I was trying to get a high Sierra install (using UEFI) on the system with the GeForce 210 I had laying around. But, in the system's BIOS, there is a little message that says that the GPU does not support UEFI, and so the system runs in legacy... but windows boots in UEFI (at least I think) even though the BIOS is forcing legacy CSM. Super confuzzled. Google has been absolutely no help...

Thanks in advance!