Intel HD4000 graphics integrated with some of their CPUs. The only major driver is open source, and Intel has been working with Valve to fix issues in their gam

Intel HD4000 graphics integrated with some of their CPUs. The only major driver is open source, and Intel has been working with Valve to fix issues in their game ports to Linux. However, to put it gently, the performance is not close to on-par with current generation Nvidia and AMD offerings.