Performance in Synthetic Benchmarks
As we could expect, the Radeon HD 4830 is inferior to the GeForce 9800 GT in the SM2.0 tests but faster in the SM3.0/HDR tests thanks to its advanced computing capabilities. You shouldn’t make any far-reaching conclusions out of these results because 3DMark06 cannot really tell us much about the highs and lows of modern graphics architectures. It can only make a kind of a stop-watch for PC enthusiasts to fix their records.
The individual tests confirm our point: the Radeon HD 4830 is slower in the first test only. It wins in the second test even though the latter is limited to version 2.0 shaders.
The Radeon HD 4830 delivers high performance in the SM3.0/HDR tests, too. It is as good as the Radeon HD 4850 in the first of them, which indicates some speed limitation, perhaps due to the memory or RBE subsystem.