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Maximum write speed on Canon 70D?

A-Furry-Peanut
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I need this mainly for shooting video if that makes a difference. 

I'm asking this because I read that even if an SD card has over 9000 write speed, the camera might bottleneck it and I can't seem to find a definitive answer anywhere.

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I highly doubt anyone would make a camera that allows you to record at a resolution and/or quality so high that it can't write that data out fast enough.  Sure you have to make sure you have a fast enough SD card, but the camera bottlenecking?  I've never heard of such a thing, and I would be shocked if they did something that stupid.  If it can't write above a certain speed, I'm sure it wouldn't offer to record with settings that would require it to go faster than that.

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According to Canon's specs, for full 1080p video recording with all I frame compression, the camera writes at 685MB/min (average), which is about 11MB/s, so if you got something faster than that, it shouldn't be a problem.

After reading your post again, I don't think that the manufacturer would implement or have a bottleneck in their system, or that it would cause a problem. As long as your SD card can be written to fast enough, there shouldn't be any problems.

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It writes at ~40 MB/s that's the speed of the 100MHz UHS-1 mode.

Canons do not support 200MHz UHS-1

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