All Transcend consumer CF cards are tested by "TestMetrix" which complies with the CFA standard for testing speed of memory cards.
Take 8GCF133 as an example: 1X = 150K Bytes/sec 133X = 133 X 150K Bytes/sec = 20M Bytes/sec
Note: All data transfer statistics provided are for your reference only. The actual data transfer speed may vary according to system specifications, settings and performance.
For further details, please visit Transcend official website.