Benchmark result for ATI Radeon HD 4850:
GL vendor: ATI Technologies Inc.
GL renderer: ATI Radeon HD 4800 Series
GL version: 3.3.10428 Compatibility Profile Context

2D simplex noise, version 2011-03-21, 2455.1 Msamples/s
3D simplex noise, version 2011-03-21, 1413.6 Msamples/s
4D simplex noise, version 2011-03-21, 870.9 Msamples/s