Running Windows through SD Card or USB thumb drive I have a 13" Macbook Air (2013) that has USB 3.0 ports and an SD card slot. I want to run Windows to play some games that are Windows only, and I didn't want to partition my main drive because it's quite small.

I'm thinking of either using a 32 GB SD card or a USB 3.0 thumb drive. Is it possible to do either of those, and if so which way will yield in better performance? In terms of read/write speed, which one is better, and can both have the same graphics power?
I tried this some 2 weeks ago on my retina 15" Mac. The usb I used was Kingston HyperX 128 gb, 3.0 . It ran WinToGo which is basically windows 8. I wanted to play Battlefield 3 but the result were very poor, I actually never managed to play multiplayer because servers kicked me for being AFK :D If you want to try some less demanding games it might work, but 32gb is not enough provided Windows alone would eat some 20-25 gb.