- Dec 12, 2006
64 - 2x2
So if the stars align you're taking out 4 faulty CUs in those 2 groups. But you're really only likely to be disabling (1 faulty+1heathy) x 2.
So you're really only being able to work around a max of 2 faulty CUs in each 64 die.
But you still disable 4 in total.
Because for each of the two faulty CUs, you're forced to disable it's twin as well.
Even if all 64 CUs are healthy, 4 are disabled regardless to always give you 60 active.