by thegdog on Tue Feb 21, 2006 3:27 pm
By default, the 1640 and EW164B firmwares support writing Verbatim DVD+R DL media with MKM-001 media code at 8x. The 1650/1655 firmwares only support it at 2.4x.
You can use MediaCodeSpeedEdit to hack the firmware to allow writing MKM-001 at 8x on 1650/1655 drives, but if you're not the type to do that, then the 1640 might be a better drive.
It's true that new firmwares for the 1640/EW164B have probably ended, but I'm still quite happy with my 1640 and see no pressing need to upgrade to a 1650/1655.