@BadJasper: The performance would be terrible. 1st, RT devices are ARM32, and Win10 ARM is ARM64, so it wouldn't run. But let's pretend it would and keep going. 2nd, those processors were much slower with less cores. Last, the MMC chips on them were slow as well. All this added up would be an awful experience. I have an original Surface RT, and just the boot experience and native apps on it now are extremely slow.