I am pretty sure my NVidia GeFoce GTX 670 (2 GB videoRAM) videocard supports CUDA. OS: Windows 7 64-bit SP1, Ultimate + latest WHQL GeForce drivers from Nvidia. GPU-Z version: 0.6.9. Here is a screenshot: EDIT: OK, I closed GPU-Z, then ran it again and the CUDA checkbox magically appeared. Is there a known issue with CUDA being detected unreliably/randomly? Maybe a conflict with other software?