Dedicated vs. Discrete Graphics

[deaconjj]

I'm not sure if the title above is even accurate. I've been banging my head against the wall trying to find a ultraportable with touchscreen and graphics card among other things (what's the point of windows 8 without a touchscreen?)...and except in the $2400+ range, there's not so much (Dell has one - Inspiron XPS 15z, but only a 720p screen that's almost 16"???).

I've been under the impression that I'd need a dedicated graphics card (NVIDIA or ATI...), but.... I've seen some ultrabooks that have the Intel HD4000 (integrated) "with 128MB dedicated video memory".

So, in our ever advancing technological world, does anyone have any feedback on running Chief (especially renderings) with an HD4000 with dedicated graphics? Would truly appreciate any feedback as my Sony Vaio screen is barely hanging on by its hinges and I need to make a decision soon!

Peace!
John