 Additionally, some newer cards are capable of pairing with 7000-series cards based on the Graphics Core Next 1.0 "Southern Islands" architecture.For example, an R9-280X card can be used in a CrossFireX setup together with a HD 7970 card, largely due to them being the same product at different clock rates.GPUOpen offers some MIT-licensed source-code for DirectGMA stuff with multiple AMD GPUs in conjunction with Direct3D 11, OpenGL and OpenCL