The primary competition for the RX 6400 consists of Nvidia's older GTX 1650 Super and GTX 1650, along with AMD's previous-gen RX 5500 XT and the slightly more expensive RX 6500 XT. We opted for the dual-slot model, mostly because that should represent the maximum level of performance you're likely to see from the GPU, whereas a half-height card might end up running a bit slower. It sounds a bit like Intel's Arc A380 right now, though at least you can find the RX 6400 in the US market.
We purchased this PowerColor ITX card at retail because no one wanted to send us a review sample. Still, we wanted to include it in our GPU benchmarks hierarchy, and it does fill a potential market niche. It's not going to make our list of the best graphics cards, but if your primary requirement is a GPU that doesn't need a 6-pin or 8-pin power connector or a modern GPU that can be found in a half-height form factor, this is it. Officially launched as an OEM-only product at the start of the year, AMD and its partners later decided to sell the cards on the retail market. The AMD Radeon RX 6400 should be the last 'new' GPU we'll see before the next-generation architectures slated to launch before the end of the year.