The Xbox 360 and PS3 processors are very similar, one main difference is the PS3 (ignoring SPUs) is single-core with two hardware threads while the 360 is triple-core with two hardware threads per core. I would imagine that if you locked the affinity of the two threads to the two hardware threads of one of the 360's processors you would see the same behavior. IIRC, The two hardware threads on those CPUs are essentially just duplicate sets of registers that each have their own instruction stream, but execute the instructions in a single shared pipeline (the benefit being that you have more instructions available to fill the rather long CPU pipeline and are less likely to unused cycles while stalled on memory fetches). As far as the actual executing instructions are concerned there would be a single stream of instructions and thus no opportunity for the memory ordering effects that you might see with two distinct cores/processors.