I would like to use Sandy Bridges integrated GPU for GPGPU computing with OpenCL. Unfortunately I was reading today that this GPU will be disabled when the CPU detects a graphics card in a PCIe slot. Another source wrote that it is only when it's not plugged into a monitor (a simple dummy plug would solve this problem). And a third source wrote that one needs the future Z68 chipset to use the Sandy Bridge GPU and a dedicated GPU. I'd really like to know who's right!