Micro SD Speeds Necessary for Gaming

So I recently bought a full windows tablet, because of the OS there isn't much space on the hard drive.

I'm planning on getting a micro sd card for additional storage but was wondering how fast you need.

The ones I was looking at were 30 mb/s but I also saw some for 80 mb/s, which is almost as fast as a standard hard drive.

If I want to play some games, watch videos etc. what speed is necessary?

Any help is appreciated thanks.

This board sucks now - thanks Gamespot for making all of the people leave - 18 hours after a post and still only a dozen posts infront of it after not getting a single response... pathetic.

The faster the better, well if you can afford it then go for it =)

http://www.amazon.com/G-Skill-Digital-Extended-Capacity-FF-SDXC64GN-U1/dp/B00965J6QE/ref=sr_1_1?ie=UTF8&qid=1387143538&sr=8-1&keywords=FF-SDXC64GN

It also comes with a life time warranty