I did mess about with MK5 T7 graphic cards and did work out the changes from the standard cards, and was able to modify a standard version of the same type bought off ebay to work happily on T7 as the T7 see it as a barcrest one, this was back around 2015 when i was messing with them, so definitely they are modified to barcrest needs. I did buy a big box of them at the time to change then to barcrest type for T7 as barcrest T7 ones were really expensive at the time! but it bit the dust, didnt progress with that, just being able to work out what barcrest did was good enough for me. it was only the electronics on them that interested me