I'm not sure why what were identical models were released under two different model numbers but that seems to be the case with the Dell Inspiron 640m / Dell Inspiron E1405. According to ChatGPT, this was related to a transition in Dell naming conventions (sound familiar?). The 640m designation is the older naming scheme whereas the E1405 naming scheme is newer. The 'E' supposedly stands for 'Entertainment' but without a dedicated graphics chip, I guess that was meant to refer to using it for DVD playback or something. It does have a row of media control buttons on the front that were common at the time. I have the model labeled as E1405 and it's config includes:

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