Based on the same Navi 23 GPU as the Radeon RX 6500 XT, the RX 6400 GPU has 12 CUs enabled, leaving it with 768 stream processors, 48 TMUs and 32 ROPs. It packs 4GB of 16Gbps GDDR6 memory on a 64-bit memory interface, ending with 128 GB/s of memory bandwidth. The card also packs 16MB of Infinity Cache. The reference version works at 2039MHz game and 2321MHz GPU Boost clocks, with TDP set at 53W.
As far as Powercolor goes, there are two versions to choose from, the Radeon RX 6400 ITX, which is a shorter, dual-slot full-height card, and the Radeon RX 6400 LP, a low-profile single slot version.
The suggested retail price is set at $159 and the ITX version can be found over at Amazon.com at that same price.