"If you are looking to get an AMD Zen CPU on a budget, the
cheapest Ryzen 5 CPU in the current line-up is the 1400 model, which for
$160 USD will get you a quad-core processor plus Hyper Threading and
clocks up to 3.4GHz. Here are some benchmarks of the AMD Ryzen 5 1400 on
Ubuntu 17.04 compared to various other Intel and AMD CPUs over the years."