The Motorola Atrix 4G and the LG Optimus 2X both feature the same Tegra 2 Chipset that uses the same 1.2 Ghz, dual-core ARM Cortex A9 processor, the same GeForce ULP GPU, the same 1GB of RAM and the same version of Android (2.2.1). Yet, when benchmarked, the Optimus 2X outgunned the Atrix in nearly every test (the Galaxy S even jumped ahead in a few of those). So what gives?
The higher resolution of the Atrix screen (960x540 compared to the 800x480 of the Optimus 2X) requires more resources from the guts of the phone, causing the benchmark dips. Check out the entire showdown ever at [Android and Me via BGR]