Performance in Simulators
Race Driver: GRID
The additional overclocking of the Gainward card only increases its bottom speed at 1280x1024. The higher memory frequency says its word at the higher resolutions and the gap grows up to 11% at 1920x1200. The difference between 512 megabytes and 1 gigabyte of graphics memory can only be observed at 1280x1024 where it amounts to 5-6%. At the higher resolutions this difference is negligible.
X³: Terran Conflict
Working at its default frequencies, the Gainward HD 4850 1024MB GS is almost as fast as the Radeon HD 4870 1GB and gets even closer when overclocked additionally. However, there is still a difference in terms of bottom speed, so the Radeon HD 4870 1GB remains a better choice for people with monitors supporting 1920x1200.