It is still good to buy faster one (newer MMCmobile type with more pins) if you plan to use it in something else too (camera, usb reader, other PDA) and prices are similar. But yes it does not help for N770. The Kingston dual voltage MMCmobile 2GB looks good and is not more expensive (here and now) than other slower RS-MMC with older 7 pin interface (Sandisk RS-MMC).