Yes! Redshift can be configured to use all compatible GPUs on your machine (the default) or any subset of those GPUs. You can even mix and match GPUs of different generations and memory configurations (e.g. 1 GTX TITAN + 1 GTX 1070). Redshift supports a maximum of 8 GPUs per session. Using a render manager (like Deadline) or using your 3d app's command-line rendering, you can render multiple frames at once on systems with multiple GPUs. This can help ensure that the GPU resources are used as efficiently as possible. For more information on hardware considerations for Redshift, please read this document.