Re: five-year-old silicon obsolete?
I use a fanless laptop with an Intel N3540, which is much faster than all my Core 2 Duo devices (also laptop processors). I also have an SSD in this laptop, and 8GB RAM. Covers all my Internet related needs. (The SSD and RAM are upgrades to this cheap Acer. The screen is unimpressive though.)
This system handles HD video etc easily (not encoding, just watching), as opposed to Core 2 Duo which never got the correct drivers to do it well, I suspect.