The level of graphics chip which is higher than NVIDIA GeForce GTX 660 or AMD Radeon R9 270 provides very good performance, ideal for designers or production studio seeking excellent iClone 6 working performance.

Graphics chips higher than NVIDIA GeForce GTX 460 or AMD Radeon HD 5970 gives normal usability, usually higher than 30 fps for most projects, while keeping good budget for personal or hobbyist's creation and design.

For an easier reference, please check with these Videocard Benchmarks: -
http://www.videocardbenchmark.net/high_end_gpus.html