20
Less power usage. The price difference is not great, but for the user, the long-term price difference will be, with all those batteries being wasted.
I can
hardly call THAT wasted. With 50mhz we have the world! (okay a little dramatic but read on..it gets more dramatic

)
why so conservative all? This is a very rare change we have! We want it to be durable right? so make it 50! We could do multitasking (drawing graphs whilst doing 1+1) and much more! The possibilities are far more unbound and the price difference is near nihil. We could easily underclock the calc later anyway and let the user choose betwen slow mode and fast mode. With rechargeable batteries batterties shouldn't be a problem.
We have until now pretty much copied TI, the design "must" be the same, we use the same sort of processors we add some ram. But oh no, no bigger screens please, no faster processors please. I mean really, this is a unique change! We could make the calculator far more then a calculator when choosing 50mhz! It adds to resale value and it costs about $5 more in production.
Will you let slip away yet another change to make this product great?!
I have been noticed that this comment might very well been seen as offending, if that is so then my apologies for its intends were not so. The above was just a act of desperation to get people voting for 50mhz. The "joke" about no bigger screens and no faster processor wasn't aimed at anyone specifically. it's intend was to help others "realize" that up till now 'we' haven't really done anything spectacular with the OTeZ80. This is just my opinion and above are the arguments for supporting it. If anyone felt jumped on by this then I, again, apologise. Just realize that it's intends were not to do so.