> Which means we need to go back to in-order PPC processors

In-order execution doesn't preclude speculative execution (branch prediction etc.).

http://morph.zone/modules/newbb_plus/viewtopic.php?forum=3&topic_id=7183&start=272

> IBM had some cool cpus built for the PS3 and the Xbox360 that were in-order.

...and the POWER6 as well (which can do speculative execution, though, so is vulnerable). But yes, Cell BE and Xenon/XCGPU may not be able to do speculative execution in which case they wouldn't be vulnerable.


Edit: added link regarding POWER6

[ Edited by Andreas_Wolf 29.01.2018 - 13:32 ]