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Expert reviews of the best discrete GPUs for running LLMs and Stable Diffusion locally in 2026.
The AMD Radeon RX 7900 XTX is the best AMD GPU for local AI in 2026. With 24GB of GDDR6 VRAM matching the RTX 4090's capacity, it runs 70B Q4 models via ROCm on Linux and offers a strong alternative for users in the AMD ecosystem — at a lower price than the 4090.
The NVIDIA RTX 4070 Super is the best mid-range GPU for local AI in 2026. With 12GB of GDDR6X VRAM at 504 GB/s bandwidth, it runs 13B models at full precision and 34B models at Q4 quantization — delivering 80% of RTX 4090 inference performance at roughly half the price.
The NVIDIA RTX 4090 is the fastest consumer GPU for local AI in 2026. With 24GB of GDDR6X VRAM at 1,008 GB/s bandwidth and 16,384 CUDA cores, it runs 70B quantized models at 15–25 tokens/second and generates SDXL images in under 2 seconds — no other consumer GPU comes close.