 When using CrossFire with AFR, the subjective framerate can often be lower than the framerate reported by benchmarking applications, and may even be poorer than the frame rate of its single-GPU equivalent.This phenomenon is known as micro stuttering and also applies to SLI since it is inherent to multi-GPU configurations.AMD CrossFireX, and NVIDIA SLI setups both require bridges, and a power supply unit (PSU) capable of supplying enough power to the GPUs.