Six of these go on sale today, while the Ryzen 7 5800X3D hits the shelves on April 20. Among the models going on sale today are the Ryzen 7 5700X, an 8-core/16-thread part positioned a notch below the 5800X, and priced at $299; the Ryzen 5 5600 (non-X), a 6-core/12-...