The speed at which G664 Granite is cut can vary depending on the type of equipment being used and the specific cutting technique. However, in general, a recommended speed for cutting G664 Granite with diamond tools is around 3,000-4,000 revolutions per minute (RPM). It is important to adjust the speed based on the hardness and density of the granite to achieve optimal cutting results while preventing excessive heat and wear on the tools. It is always advised to consult the manufacturers instructions or seek professional advice when cutting specific types of granite.