ASRock RX6400 CLI 4G graphics card

Compact ITX graphics card

The ASRock Challenger Radeon RX 6400 is a single-slot ITX graphics card built on the RDNA 2 architecture with 768 stream processors and 4GB of GDDR6 memory on a 64-bit bus. It targets small-form-factor builds that need a modern display output and hardware-accelerated decode without a large power budget. The card draws 53W and only requires a 350W power supply.

Upgrade from integrated graphics

This card replaces a processor’s integrated graphics when the system lacks a discrete GPU or when the onboard video cannot drive a 7680 x 4320 display over HDMI 2.1 or DisplayPort 1.4. The jump is worth it for multi-monitor productivity, hardware video decode, and entry-level 1080p gaming where integrated graphics stutter or lack the required outputs.

Sustained load behaviour

Under continuous load the 53W thermal design power keeps heat output modest, allowing the single fan to maintain stable clocks near the 2039 MHz game clock without aggressive ramping. The 0dB silent cooling feature stops the fan entirely at low temperatures, so noise only appears when the GPU is actually working. The ITX length of 162 mm ensures airflow is not blocked in tight cases.