Performance comparison: which is faster?
Radeon RX 7900 XT (AMD, 2023) and Radeon RX 7800 XT (AMD, 2023) are compared here. Compare scores and VRAM, generative AI usability, and CPUs that pair well with each GPU.
Overall performance: RX 7900 XT is about 39.1% faster
For generative AI, the higher-VRAM RX 7900 XT（20GB） 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 7900 XT | RX 7800 XT |
|---|---|---|
| Performance Score | 32,000 | 23,000 |
| VRAM | 20GB | 16GB |
| Manufacturer | AMD | AMD |
| Series | RX 7000 | RX 7000 |
| Release Year | 2023 | 2023 |
| Compatible CPU Example | Ryzen 9 9950X3D | Ryzen 7 5800X |
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 7900 XT also run here)
| If You Want To... | Recommended |
|---|---|
| Prioritize high fps and smooth performance in demanding games | RX 7900 XT |
| Run larger generative AI and LLM models | RX 7900 XT |
| Prioritize value and adequate performance | RX 7800 XT (the lower model is often sufficient) |
RX 7900 XT is about 39.1% higher by score (RX 7900 XT: 32000 points / RX 7800 XT: 23000 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 7900 XT has 20GB of VRAM, while RX 7800 XT has 16GB; RX 7900 XT has more. If image generation or a local LLM is even a possibility, the higher-VRAM option provides more room.
Using our guideline, Ryzen 9 9950X3D pairs well with RX 7900 XT and Ryzen 7 5800X with RX 7800 XT (CPU:GPU ≈ 0.9:1). If the CPU is too weak, replacing the GPU may not raise fps, so check the combination before buying.
