The Detailed Benchmarks
Giants utilizes second generation, DirectX 7 based T&L features in hardware.
At 1024x768-32, the field is very close together. Jumping to 1600x1200, we see the group split into categories determined by card type and, consequently, clock speed. The RADEON 8500 is easy prey for the Titanium boards in this benchmark, and can only pull ahead of the GF2 Ti class that starts at 1600x1200. The GF2 Ti class, in turn, holds a lead over the RADEON 7500.
The different scores even within the card classes (despite identical clock speeds) are a result of the different driver versions favored by the companies. Besides that, a certain margin of error is always present in benchmarking.