Performance comparison: which is faster?
Radeon HD 6870 (AMD, 2011) and Radeon RX 550 (AMD, 2017) are compared here. Compare scores and VRAM, generative AI usability, and CPUs that pair well with each GPU.
Overall performance: HD 6870 is about 6.7% faster
For generative AI, the higher-VRAM RX 550（2GB） 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 | HD 6870 | RX 550 |
|---|---|---|
| Performance Score | 3,200 | 3,000 |
| VRAM | 1GB | 2GB |
| Manufacturer | AMD | AMD |
| Series | HD 6000 | RX 5000 |
| Release Year | 2011 | 2017 |
| Compatible CPU Example | Core 2 Quad Q9550 | AMD Phenom II X2 560 |
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 550 also run here)
| If You Want To... | Recommended |
|---|---|
| Prioritize high fps and smooth performance in demanding games | HD 6870 |
| Run larger generative AI and LLM models | RX 550 |
| Prioritize value and adequate performance | RX 550 (the lower model is often sufficient) |
HD 6870 is about 6.7% higher by score (HD 6870: 3200 points / RX 550: 3000 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.
HD 6870 has 1GB of VRAM, while RX 550 has 2GB; RX 550 has more. If image generation or a local LLM is even a possibility, the higher-VRAM option provides more room.
Using our guideline, Core 2 Quad Q9550 pairs well with HD 6870 and AMD Phenom II X2 560 with RX 550 (CPU:GPU ≈ 0.9:1). If the CPU is too weak, replacing the GPU may not raise fps, so check the combination before buying.
→ HD 6870 Details ／ RX 550 Details ／ Compare Another Combination
