Under the Linux microscope today is the Intel Iris Graphics 5100 (GT3) found on the Core i7 4558U CPU within the ASUS Zenbook UX301LA "Haswell" ultrabook. How do the Intel Iris Graphics performance compare between Windows 8.1 and the soon-to-be-released Ubuntu 14.04? We can tell you the answer today with a fresh round of multi-OS OpenGL benchmarks from this high-end Intel ultrabook.

The Intel Iris Graphics 5100 sports 40 execution units and a 1.2GHz clock speed to offer up to 832 GFLOPs of power on the graphics core. Sadly compared to the Iris Pro 5200 Graphics, there isn't the 128MB of embedded DRAM, but at least the graphics performance of the Iris 5100 is still a big upgrade over the HD Graphics 4400/4600 found more commonly on Haswell processors. The Intel Core i7 4558U processor on this ASUS UX301LA is a dual-core part with Hyper Threading and runs at a base frequency of 2.8GHz but its Turbo Frequency tops out at 3.3GHz. The max TDP of the CPU is 28 Watts. The Iris Graphics 5100 are capable of driving three displays simultaneously.