Actually they are. AMD handles caches differently than the ring bus architecture. The way AMD is secure is due to their architecture. Intel noted the possibility using the ring bus architecture of the side channel attacks back in the late 90’s and ignored the finding. Intel doesn’t secure the cache hoping ring permissions would be enough. It was not. Now they have a mess due to lack of development of a much more secure processor needed to stop the side channel attacks of which there is a plethora of now.\n\n\nYou don't seem to have any idea what you're talking about, so I don't think this discussion is productive. You're mixing multiple concepts in a single sentence that aren't architecturally related. Side channel attacks are based on the physical attributes of the processor, like power consumption monitoring, among other things. Intel CPUs have numerous security vulnerabilities, but a lot of them are due to SGX itself not being secure, and your fixation on Ring-Bus shows you don't understand how CPUs work.