RTHDRIBL
RTHDRIBL's hand-written shaders are a pathalogical case for NVIDIA's hardware, even their latest incarnations. RV410 suffers no such performance problems in this case, either the driver or the hardware optimised for the instruction order and texture access patterns (the test is very texture heavy, doing multi-sampling in the pixel shader). A nice demonstration on the way software can execute differently on hardware in the same basic performance class.
