Race Driver GRID
I tested this absolutely gorgeous-looking game with FRAPS, as well, and in order to keep things simple, I decided to capture frame rates over a single, longer session as I raced around the track. This approach has the advantage of letting me report second-by-second frame-rate results.
Even a single Radeon HD 4870 is faster than the GeForce GTX 280 in this game, and performance scales pretty well from there with the X2, so that it nearly doubles the average frame rate of the GeForce GTX 280.
This game doesn't always scale well with multiple GPUs, though. The Radeon HD 3870 X2's results illustrate that. Even with the latest public driver release for the 3870 X2, Catalyst 8.6, the game doesn't make use of both GPUs. The Radeon HD 4000-series drivers we're using are newer and have a CrossFire profile for GRID included. This is the issue, of course, with multi-GPU configurations, including the 4870 X2. Newer games will often require driver updates before the card can live up to its potential.