Can AMD Radeon RX 6900 XT run CogVideoX-5B?
5B parameter Video Gen model on 16GB GDDR6
VRAM Requirements
CogVideoX-5B is a 5B parameter model. At full precision (FP16), it requires 18GB of VRAM. Your AMD Radeon RX 6900 XT has 16GB, so you'll need to quantize it to 8-bit (Q8) to fit.
Maximum quality, no quantization
Near-lossless, ~50% size reduction
Good quality, ~75% size reduction
Recommended system RAM: 32GB DDR5 (2x GPU VRAM minimum for model overflow)
What This Means in Practice
CogVideoX-5B at 8-bit precision on AMD Radeon RX 6900 XT generates video clips with near-identical quality to full precision. Generation times are similar — video gen is bottlenecked by compute more than memory at this precision. A solid setup for local video generation.
AMD Radeon RX 6900 XT Specs
Other GPUs That Run CogVideoX-5B
Other Video Gen Models on AMD Radeon RX 6900 XT
About CogVideoX-5B
Tsinghua's open video generation model. Generates 6-second clips at 720p. More accessible VRAM requirements than larger video models. Good starting point for video gen experiments.