Our research includes 66 expert total reviews for 10 best desktop pcs under $400. The highest average score is 89%, while the lowest is 72% (a gap of 17%). There are about 7 reviews per product. Reviews come from sites like PCMag, Wired, and more. Click on a product to see more information (including which reviews were included). This list gets updated every few days as we routinely add the latest products.