The reason to such a table turn is not yet clear. Some sources say that it is because HTC could not be supplied with chipsets of Snapdragon 800, but this argument holds very less weight, don’t you think? I mean what do they plan to do with the rest of the smartphones that have promised a Snapdragon 800 like Samsung Galaxy Note 3 , LG Nexus 5 and so many others. It is really hard to believe that Qualcomm can’t produce enough chips to supply the companies of these smartphones.
Another theory states that HTC is looking forward to cutting costs, although the company is aiming for the premium market with the HTC One. So, choosing an older chipset is a delibrate decision. This also hints toward the idea that the HTC One Max will be using a Snapdragon S4 Pro, and not a Snapdragon 600.