ATP trails in the burst with a top-end of 55.1MB/sec, but manages to keep reading faster at 52.3MB/sec.  It certainly is no slouch as you can see in Crystal DiskMark as well.  Even though the random 4K and 512K performance isn't great when writing to the card, keep in mind that RAW image sizes are around 9MB.  You'll see great performance on this card. . .

ATP 16GB ProMax II 650x CF Card Review - BCCHardware