Arnold is a very powerful rendering engine and performs extremely well when running on processors with lots of physical cores. Because of this, our single CPU system utilizes Intel's Core X desktop chips with anywhere from 6 to 10 cores. This high core count allows them to complete renders much faster than a typical quad-core CPU.
Just because this system is terrific for rendering doesn't mean it isn't also great for general modeling work. All of the CPU options on this system are able to Turbo to speeds up to 4.5GHz, which makes this system a great compromise when you need excellent rendering performance but also need the system to perform well when working in 3D modeling applications such as SOLIDWORKS, 3ds Max, Maya, or Cinema 4D.