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Quote:
Originally Posted by blitz
fastest SD right now is 150x where 1x is equiv to 150KB/s or 22.5MB/s
the older SD 1.01 standard allows for a theoretical 12.5 MB/s maximum transfer speed.
the older MMC standard is slow but the next generation MMC4.1 standard has the potential to run at speeds up to 52MB/s.
to distinguish it from the original MMC, the net-gen MMC is called MMCplus or Hi-Speed MMC and uses 13 pins instead of 7
i have to add that, in most cases, real world speed is limited by the host device.
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MMCplus is fully backward compatible with MMC and SD devices

majority of my mmc cards are now MMCplus...ready for the next gen devices
blitz is right, speed limits are usually on the device side. cards today perform very well may it be sd or mmc.
a 150x sd card used in the latest high end cameras today for example can only still performe 5 to 6mbps or 1/4 that of its full potential. similarly if you wer to use a slower rated 66x sd card on that same device would perform say 5mbps or 1/2 of its full potential. its almost always limited to the device ang speed.