I am aware that the X runs android , but I really am concerned with the older processor
don't be so much in to latest tech need..
how frequent u change ur phone? if u use ur phone less than 2 years, the processors are not older for ur use.
if u r not gonna change for say 3-4 years, then buy latest, which will be by then, obsolete.
remember ur needs, don't bother the "latest tech".
latest and older are the terms brought by the phone makers to sale what they have, not what u need.
think in this way, Lumia 920 was released in late 2012, and it's gonna get update 8.1, and u can use for at least one more year with that update.
now tell me where is the older processor. it survived 2-3 years with update. and i am sure about, those who bought it at the beginning, most of them are still using it happily.
same things happen with PCs also. my old PC, which were not so fine with old Vista or XP (in my office), are working nicely with Win 7 & 8. in fact better that Vista. the processors are age old, RAM is also 1-2 GB, but the development in Windows is also to be considered, not just processors.