AMD FirePro V4900
EnSight on SPECViewPerf 10.0 with the FirePro V4900 was about 7% faster than the FirePro V5800, but still well behind the FirePro V5900.
Maya from SPECViewPerf 10.0 on the FirePro V4900 was 35% faster than the older FirePro V5800 while the V5900 still carried a 16% lead.