This particular product is version 1. The one for version 2 is this http://www.amazon.com/Linksys-Performance-Dual-Band-E4200-v2/dp/B0068ALV8Q/ref=sr_1_1?ie=UTF8&qid=1354196392&sr=8-1&keywords=e4200v2 . You are also correct that the different versions of the router accounts for different CPU or chipset.
Did the routers die or were the power adapters to blame? I had a trusty old Linksys (now Cisco) router (BEFSX41 ver. 2) stop working after 4 years because the power adapter had degraded over time, which caused it to output an increasing voltage (over 50%). Eventually my Linksys router died due to being cooked by its own power supply! That is what a digital multimeter can show, if you have the curiosity to dig deeper. I suspect that many router deaths are attributable to poor (cheap) power adapters that should stop functioning when they output more than 20% higher than the desired voltage output.
Sorry but that's PRECISELY what I did and it works juat dandy. Disable WiFi on ATT modem; disable DHCP server on E4200 and assign no conflicting ip to E4200 like 192.168.1.2 and voila works like a champ.
This is the worst router I've ever bought. This is my review for Amazon.
I never review anything I buy, ever. But this router has to be the worst piece of junk that I have ever bought. I honestly feel scammed, that's right SCAMMED. Wireless signal drops out frequently, by frequently I mean every 10 minutes or so. Packets are dropped at a rate of 20% or more. This so-called product, is an embarrasment for a company like Cisco to be selling. Please don't waste you money, or don't say I didn't warn you.
If you feel like getting a second opinion just Google "e4200 dropped packets" and read for yourself.
Oh and by the way, this is the 2nd e4200 router I've bought, because I thought my fist one was a dud (bought in Best Buy). What are the chances of getting 2 bad routers from different suppliers.... either 10000:1 or they are all plain broken.