In case you're not planning on playing games on the go then take a look at:
http://www.villageinstruments.com/tiki-index.php?page=ViDock I've been using ViDock for the past 1.5 years and it's really decent. I have a GTX 760 in the case ( connected to my late 2012 13" rMBP ) and I can run all the games I play on very high / extreme settings with more than decent FPS ( I also used to play some WoW, D3, SC2, Dota 2, Heroes of the Storm, Battlefield 4, etc. ).
That being said, it of course has some cons too: you can't really carry it around and you'll also need a Thunderbolt adapter so that you can hook it up to your notebook; you'll not get 100% GPU power / performance due to how the entire setup works, but it sure beats the integrated GPU; the entire setup could get on the expensive side ( except if you already own a decent GPU that you can shove into the ViDock; I can understand that many people wouldn't want to spend another nice amount of money on 3rd party hardware so that they can run some games decently on a not so cheap notebook ); starting it up properly can be tricky at first, but you'll get used to it ( in essence - at least in my case - i need to plug the adapter in right after I choose the OS to boot into and the screen goes black - NOTE: I've only really used it under bootcamp, Windows 7 / 8.1; not sure about OSX to be honest, but I'd anyway only run games under Windows because OSX versions are rarely well-optimized ); if your Thunderbolt port is kinda loose, then small movements could disconnect the eGPU from the notebook... this will usually result into a system crash and you'll have to restart ( performing the same actions as at the very first boot - otherwise you'd end up running the integrated GPU after the restart ).
PS: WoW saw quite a non-trivial update with the most recent expansion; I'm especially referring to the higher definition graphics that were added, this also implies that the system requirements for the game have been upped quite a bit... because of the increased rendering requirements, the most recent version of the game is no longer very playable / pleasant on systems that don't have a decent / dedicated GPU ( not saying the 6100 isn't "decent", but we can all agree that it wasn't designed for gaming ).
It would make life much easier if Intel would allow manufacturers to market stuff like this:
https://www.change.org/p/intel-allo...-allow-the-sale-of-affordable-egpu-enclosures but who knows when will this happen ( if ever )...
I was initially hoping to get the T004 Silverstone but then it became clear that I might need to wait until the end of time... that's when I decided to give ViDock a shot and also because I didn't feel like going for a "do it yourself" eGPU solution - buying all the individual components from N sources and putting the entire thing together from scratch.
