Hui Reading, writing Pooh!

I have the reading and writing rate of Transcend 16GB 1000x compared to the 600x the same capacity, as I described both cards with 14,3GB image data (DNG) and the data then copied back (two passages). Source or destination was a SSD was used a USB3.0 card reader Lexar. The 1000x is described considerably slower than the 600x (4:20 min to 4:00 min). When reading reaches the max 1.000x. 137 MB / s compared to 88 MB / s of 600x (1:57 min to 3:00 min). The speed with my EOS 1div I have not tested. It seemed to the high reading speed, so I keep the cards (2 pieces, both tested). Who mainly high write performance is required "slower" with the (and cheaper) 600x probably better served.