How much performance can be had out of a super-small PC? If we base our opinions on Corsair's ONE i164, the answer is a simple "a lot". Coming in at 15-inches tall, this PC bundles not just Intel's eight-core i9-9900K inside, but also NVIDIA's top-end GeForce RTX 2080 Ti. We recently battered the i164 with an obscene amount of testing, so let's explore our findings.