I use my own laptops all the time when I'm working for various companies. I usually use their monitors and peripherals. Common in the UK.

Desktop CPU power is fairly affordable. Equivalent mobile CPU power not so much.

So, why not build the tiniest Mini-ITX system possible? This would be much cheaper and faster than a top-end laptop.

The dream: Portable 2.5l desktop PC with ~100w TDP CPU.

I found a tiny case that suits the idea - Mini Box M350. It's 2.5litres. http://www.mini-box.com/M350-universal-mini-itx-enclosure

But, getting a Skylake 91w TDP 6700K CPU into a 65w TDP case is the real challenge. And I know little about dissipating heat other than finding good fan placement.

Is this a realistic idea?

I'm dreaming of an ultra-powerful tiny computer that can be extended (thunderbolt) with a powerful GPU sometimes.

Thunderbolt 3 is going to make the USB 3.1 Type-C connecter unbelievably useful by being able to carry 40gbps of thunderbolt data with HDMI, DP, PCIE, USB 3.1 etc.

I'd love to stick a 6-core i7 5930K in that case, but it is hot and lacks integrated GPU.

Other skylake chips should be announced end of this month.

But, how to cool this thing?