I haven't bought the KomputerBay 1000x cf card yet. I have an old Transcend 400x which I think is not capable of raw recording at high resolutions with menus. I was able to raw record but I set it to 1280x720 with the menus turned off.
Transcend 400x is rated for 60mb/s (150Kbp/s( Industry standard transfer rate) x 400 = 60Mb/s. With KomputerBay 1000x, based on the formula,it is 150Mb/s. The Canon 50D is UDMA 6, based on the CF specification (
http://en.wikipedia.org/wiki/UDMA), it's transfer rate is capable of 133Mb/s.
In the end, KomputerBay is the best;but I heard too that it's out of spec. A lot of manufacturer's are! We'll be happy if it reaches 100Mb/s.
The question: Are the Canon camera's out of spec. or the card manufacturers? or maybe, the software overheard in ML; all the features. The proof is pointing to the features of ML? GD off,ETTR off,etc. and turning off some features makes the big difference. True or not, we'll find out, testers!
:-)