integrated graphics NOT disabled as expected in bootcamp on MBP

i've upgraded my macbook pro (early 2011) to a dual ssd setup.

note: i was running windows 10 bootcamp without problems before (upgraded from a windows 7 bootcamp install)

i had a really tough time, but finally managed to do a CLEAN install of windows 10 from usb ( ! for the lack of the optical drive - i used a mac mini to create the image since bootcamp on my model macbook pro does not support that... or windows 10 in general, but as i said it did run without flaws).

have osx on one drive (no issues there), windows 10 on the other.

...almost:

it seems the system "forgot" to disable/hide the integrated intel graphics chipset, it now shows up along with the dedicated radeon in device manager.

i'd actually need to use the radeon, but it's driver is constantly stopped with error code 43, i'm suspecting because the integrated gpu is interfering. i'm basing this guess on the fact that i've tried multiple versions of the ati/amd drivers - many of which DID work in my original w10 bootcamp setup.

so how could i get my mbp to a state where the integrated intel chipset is gone/forgotten/hidden like it should be? (i tried the obvious ones: disabling/uninstalling the device from device manager, but it creeps right back after restart), my best guess is i'd need to poke the uefi/bios emulation, but am unsusre how to do that.

getting desperate, any ideas welcome, thanks in advance!