Any 7D users out there that can comment on if a 7D can gain any benefit from the 1000x vs 400x. I've got a couple 400x and occasionally will max the buffer. Always figured it was the camera, but with cards on sale, might as well ask if it might be the cards! If a card would also benefit me, could have quite the boost once the new firmware is released!
The 7D will not see any speedup or gain from these cards. Performance with SanDisk Extreme (60MB/s), SandDisk Extreme Pro (90MB/s) and the Lexar 1000x (150MB/sec) all turn in the same level of performance. The 7D cannot take advantage of UDMA-7, so the Lexar 1000x is of no benefit for shooting.
I have an 5D3, 5D2, and a 7D, only the 5D3 sees the difference due to it being able to use the UDMA-7 interface. And it's a significant difference as I noted earlier.