Intel and AMD x86 achitecture[edit]
Intel[4]
Intel Westmere based processors, specifically:
Intel Westmere-EP (Xeon 56xx) (a.k.a. Gulftown Xeon 5600-series DP server model) processors.
Intel Clarkdale processors (except Core i3, Pentium and Celeron).
Intel Arrandale processors (except Celeron, Pentium, Core i3, Core i5-4XXM).
Intel Sandy Bridge processors:
Desktop: all except Pentium, Celeron, Core i3,[5][6]
Mobile: all Core i7 and Core i5. Several vendors have shipped BIOS configurations with the extension disabled;[7] a BIOS update is required to enable them.[8]
Intel Ivy Bridge processors
All i5, i7, Xeon and i3-2115C[9] only.
Intel Haswell processors. (all except i3-4000m,[10] Pentium and Celeron)
Intel has a list of processors that support AES-NI on their website[11]
AMD
AMD Bulldozer-based processors.[12][dead link]
AMD Piledriver-based processors.
AMD Steamroller-based processors.
AMD Jaguar-based processors.
AMD Puma-based processors.