Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
The GPU supports DirectX 10 and OpenGL 2.1.
I would however suggest getting the 2100 over the 540. The HD 2000 performs better, and has DirectX 10.1 and OpenGL 3.0 support.
See here for some comparisons: http://www.anandtech.com/show/4083/...core-i7-2600k-i5-2500k-core-i3-2100-tested/11
The 540 has the same inbuilt GPU as the 660, which runs at 733mhz. The 2100's GPU is the HD 2000.
Thanks for the info I'd go for the 2100 cpu but the only ITX boards I've seen are socket 1156