RT-AC68U/R versus RT-AC68P? What's the difference?

[VirtualLarry]

I think that the 68P has a faster dual-core CPU, from my reading. Trying to figure out if that's the only difference, and if they are able to take the same firmware.

(I want to put Tomato on. There's a specific AC68U build, which I'm using on a refurb AC68R at the moment.)

Newegg has the AC68P for $100 refurb on ebay, while the AC68R refurbs are $120. If they take the same firmware, and the only spec change is a faster CPU, then it seems to be a no-brainer to get the 68P, but I'd like some confirmation first.

RT-AC68R is a retail version of the RT-AC68U, which is sold online. They are supposedly the same. RT-AC68W is white (all others are black). RT-AC68P has a faster, 1GHz CPU (all others have an 800MHz CPU).
By David McCulloch on March 18, 2015

https://www.amazon.com/Wireless-AC1900-Dual-Band-Gigabit-RT-AC68P/dp/B00PZX26NQ

 

[Elixer]

Faster CPU & faster USB 3.0 storage performance, I am guessing because of the faster CPU.

http://www.smallnetbuilder.com/wire...-band-wireless-ac1900-gigabit-router-reviewed

 

[ylin0811]

most consumer grade routers process the packet forwarding using the cpu. if this is true with the asus router, then it will give you a faster raw pps without any features turned on.

 

[VirtualLarry]

http://www.snbforums.com/threads/rt-ac68p-and-tomato-arm-firmware.20944/

Short answer: Looks like a no-go, until the specific board differences are accounted for.

Edit: Seems that info is outdated?

• RT-AC68P: Also known as RT-AC68U V2, since it is a bug fix version of AC68U, with the CPU changed to ARM dual core BCM4709 @ 1GHz. Use Shibby V129 or later. Can also use Merlin firmware. [Note: Netgear R7000 has the same level of hardware]
• RT-AC68U: ARM dual core BCM4708A @ 800MHz, 128MB Flash, 256MB RAM, 3×3 AC1900 (AC1300 + N600). It has a USB 3.0 performance issue that is fixed in AC68P hardware. Use Shibby V118 or later. Can also use Merlin firmware.
• RT-AC68W: Same hardware as RT-AC68U but in white color
  
  https://moonlightknighthk.wordpress.com/2012/02/04/install-tomato-firmware-on-asus-router/