PPC970MP altivec supported testing with a PowerMac11 2 and AMD CEDAR (DRM 2.49.0 / 4.10.17-gentoo) 512MB on Gentoo/Linux via the Phoronix Test Suite.
Compare your own system(s) to this result file with the Phoronix Test Suite by running the command: phoronix-test-suite benchmark 1707211-ERNS-MERGE7133