Nice READ/WRITE Info from the Lexar Support! Found on an Amazon Guy who post this: hope that helped...
Lexar Professional 1000x UDMA Compact Flash :
150MB/s minimum guaranteed read
16GB - 95MB/s minimum guaranteed write
32GB and above - 145MB/s minimum write
(when paired with a UDMA 7 enabled device)
Lexar Professional 800x UDMA Compact Flash:
120MB/s minimum guaranteed read
8GB-32GB 45MB/s minimum write
64GB - 128GB 75MB/s minimum write
(when paired with a UDMA 7 enabled device)
Lexar Professional 600x UDMA Compact Flash:
600x (90MB/s) guaranteed minimum sustained write speed
(when paired with a UDMA 6 enabled device)
Lexar Professional 400X UDMA Compact Flash:
400x (60MB/s) guaranteed minimum sustained Read speed. Write up to 45MB/s
Lexar Professional 300x, UDMA Compact Flash:
300x (45MB/s) guaranteed minimum sustained write speed
Lexar Professional 233x UDMA Compact Flash:
minimum sustained write speeds of (233x) 35MB per second when paired with a UDMA-enabled device
Lexar Professional 133x UDMA Compact Flash:
Some of the earlier versions of these cards also came with Write Acceleration (WA) but these are no longer provided.
Lexar Platinum II/Premium 200X Compact Flash :
200x
30MB/s
here the full report on german:
http://www.amazon.de/review/R1WPGHNNQPKH0O/ref=cm_cr_dp_title?ie=UTF8&ASIN=B008QA4ETY&channel=detail-glance&nodeID=340843031&store=computers