Other Relaxed Models  Similar relaxations as WO and RC  Different types of safety nets (fences)  Alpha – MB and WMB  SPARC V9 RMO – MEMBAR with 4-bit encoding  PowerPC – SYNC  Like MEMBAR, but does not guarantee R  R (use isync)  These models all guarantee write atomicity  Except PowerPC, the most relaxed model of all  Allows a write to be seen early by another processor's read 37