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The RT-AC1900P is newer and has updated internals, including better power amplifiers and a faster 1.4 GHz dual-core processor.
Sorry, there was a problem. Please try again later.the AC68P has a 1GHz dual core chip, this one (AC1900P) has a 1.4 GHz dual core chip
Sorry, there was a problem. Please try again later.http://www.smallnetbuilder.com/wireless/wireless-reviews/33043-asus-rt-ac1900p-dual-band-wireless-ac1900-gigabit-router-reviewed
Sorry, there was a problem. Please try again later.Want the real answer? Not much. Check it's line history: ASUS RT-AC66U ASUS RT-AC66U B1 ASUS RT-AC66U B1 (V2) ASUS RT-AC67U (R/W) ASUS RT-AC1750 (R/W/V2) ASUS RT-AC1900 (R/V2) ASUS RT-AC1900P There are as many 8 and p models as there are 6 and U. They will make a tiny change, as in everything identical except change the mfg of one memory chip and give ir a new model number. It was such an amazing line it's kept being highly rated for almost 7 years now doing that. If you wan t to really check them all out, the perfect place to study wikidevi, and the 68P is located there at the following link: https://wikidevi.com/wiki/ASUS_RT-AC68P
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