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You might be getting a bit confused by all the claims from memory manufacturers these days. On my desk I have a stack of memory cards labelled anything from "40X" to "150X". These refer to theoretical maximum speeds of transfer and generally the higher the number the better. You have to be a little bit cautious because lots of factors come into play - especially that some manufacturers are not above being slightly generous with the numbers. So I was a little sceptical when a press release crossed my desk claiming that a manufacturer had come up with "300X" cards. I was about to delete it when I noticed it was from Lexar. Lexar currently make some of the fastest memory you can buy and they rate it at 133X. It's on a par with SanDisk Extreme IV cards - which of them is faster depends on your camera, firmware version etc. Now Lexar are saying that they have a card that's 3 times as quick as their current fastest - all of a sudden I'm interested. Reading further into the details and as expected the numbers start to come down a little. They are using UDMA technology - as long as you have a compatible device you can expect them to perform 125% better than their current best...