They claim keeping support of the new cpus on older OS is difficult from security stand point. I can understand that to point if the security holes in the OS are due to hw, but OS security issue that do to OS software should not be with held. OEM company probably payed them to keep supporting the SYSTEMS so long as there using OEM install that came with the system. I have no doubt people will find way around this. like they been find way for decades to active windows. if this block is being done cause it truly will cause issue down the road wont be seen untill few years pass imo i think it ploy between CPU makers and MS .