Performance comparison: which is faster?
Radeon R9 280X (AMD, 2014) and Radeon RX 6400 (AMD, 2022) are compared here. Compare scores and VRAM, generative AI usability, and CPUs that pair well with each GPU.
Overall performance: nearly equal
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 | R9 280X | RX 6400 |
|---|---|---|
| Performance Score | 5,000 | 5,000 |
| VRAM | 3GB | 4GB |
| Manufacturer | AMD | AMD |
| Series | R9 | RX 6000 |
| Release Year | 2014 | 2022 |
| Compatible CPU Example | AMD A8-7670K | AMD A8-7670K |
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 | R9 280X |
| Run larger generative AI and LLM models | RX 6400 |
| Prioritize value and adequate performance | R9 280X (the lower model is often sufficient) |
Their scores are nearly identical (R9 280X: 5000 points / RX 6400: 5000 points). In this case, compare price, VRAM, and power draw.
R9 280X has 3GB of VRAM, while RX 6400 has 4GB; 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 R9 280X and AMD A8-7670K with RX 6400 (CPU:GPU ≈ 0.9:1). If the CPU is too weak, replacing the GPU may not raise fps, so check the combination before buying.
→ R9 280X Details ／ RX 6400 Details ／ Compare Another Combination
