AlTin, Some additional questions may be helpful to understand the complete problem domain: What brand and model of mainboard are you using, or, if you are using a manufactured computer, which manufacturer and model? What Operating System are you using? Are you using the nVidia Control Panel? If so, have you setup a Global Profile as well as added the Mastercam software to use the nVidia GeForce GTX 1070 GPU? Have you activated PhysX and, if so, have you set it to use the nVidia GeForce GTX 1070 GPU rather than Auto or the CPU? Finally, if this is a custom built computer, was the nVidia GeForce GTX 1070 card placed in the PCIEx 16X slot (that CPU will only support a single PCIEx 16X slot - see https://ark.intel.com/products/88191/Intel-Core-i5-6600K-Processor-6M-Cache-up-to-3_90-GHz) for further details. Kindly reply with some additional information and, hopefully, this issue can be resolved.