Performance comparison: which is faster?
Radeon RX 6400 (AMD, 2022) and Radeon R9 280 (AMD, 2014) are compared here. Compare scores and VRAM, generative AI usability, and CPUs that pair well with each GPU.
Overall performance: RX 6400 is about 11.1% faster
For generative AI, the higher-VRAM RX 6400（4GB） has the advantage. For gaming, prioritize performance score and CPU compatibility; for AI, prioritize VRAM.
Relative performance score (higher is faster). Actual fps varies by resolution, game, and CPU configuration.
| Item | RX 6400 | R9 280 |
|---|---|---|
| Performance Score | 5,000 | 4,500 |
| VRAM | 4GB | 3GB |
| Manufacturer | AMD | AMD |
| Series | RX 6000 | R9 |
| Release Year | 2022 | 2014 |
| Compatible CPU Example | AMD A8-7670K | AMD FX-4100 |
These generative AI models can run on only one GPU because of the VRAM difference (Stable Diffusion, Flux, LLMs, and others).
— None (all models that run on RX 6400 also run here)
| If You Want To... | Recommended |
|---|---|
| Prioritize high fps and smooth performance in demanding games | RX 6400 |
| Run larger generative AI and LLM models | RX 6400 |
| Prioritize value and adequate performance | R9 280 (the lower model is often sufficient) |
RX 6400 is about 11.1% higher by score (RX 6400: 5000 points / R9 280: 4500 points). Actual fps also varies by resolution, game, and CPU, so price is a reasonable deciding factor when the gap is only a few percent.
RX 6400 has 4GB of VRAM, while R9 280 has 3GB; RX 6400 has more. If image generation or a local LLM is even a possibility, the higher-VRAM option provides more room.
Using our guideline, AMD A8-7670K pairs well with RX 6400 and AMD FX-4100 with R9 280 (CPU:GPU ≈ 0.9:1). If the CPU is too weak, replacing the GPU may not raise fps, so check the combination before buying.
→ RX 6400 Details ／ R9 280 Details ／ Compare Another Combination
