rscheffler
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More is better, right? 
I do agree though that a roughly ~5 second burst in RAW is on the weak side for a high fps, moderate resolution, high performance camera. But at least for me, for situations where I'm generating a lot of files, I've pretty much entirely moved over to CRAW.
Based on how other cameras have worked, with RAW at very low ISOs like 100-200, you'll get a bit more than the specs, but probably not a huge amount. At higher ISOs it will be less. It will also depend a lot on subject content. A subject shot with a long, fast lens that is well separated from the background will result in smaller file sizes and a deeper buffer depth than a high detail scene.
If 40fps is needed along with deeper burst depth, then it will have to be CRAW. If 40fps is not necessary, then it should be possible to extend buffer depth by using either 30 or 20fps. Unfortunately there is no 25 fps option. 30fps may not make a huge difference compared to 40fps with standard RAW, but should with CRAW. Biggest gain in terms of burst depth at standard RAW will likely be at 20fps, which will probably give you around 3-4x more depth. 20fps CRAW will probably be virtually unlimited.
While I'm guessing the camera won't write at the maximum speed of the fastest cards, a fast card might still make a slight difference.
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