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NVIDIA GeForce RTX 4090 vs AMD Radeon RX 7900 XTX

For running models locally, priced in Germany. At 128k context the first runs 9 models fully in memory, the second 8.

In short

Both have 24 GB of memory for models; the NVIDIA GeForce RTX 4090 has 1,008 GB/s of bandwidth and the AMD Radeon RX 7900 XTX 960 GB/s. At 128k context the NVIDIA GeForce RTX 4090 runs 9 of the models we track fully in memory and the AMD Radeon RX 7900 XTX 8; only the NVIDIA GeForce RTX 4090 holds Ministral 3 8B. On the models both run fully in memory, the NVIDIA GeForce RTX 4090 is about 1.2× as fast as the AMD Radeon RX 7900 XTX (estimated, median across models). In Germany the NVIDIA GeForce RTX 4090 costs 3.955 € at eBay and the AMD Radeon RX 7900 XTX 1.555 € at eBay: the AMD Radeon RX 7900 XTX is 2.400 € cheaper.

Updated . Speeds are estimates; how they are worked out.

NVIDIA GeForce RTX 4090

3.955 €

eBay

Add to build
AMD Radeon RX 7900 XTX

1.555 €

eBay

Add to build

Specifications

SpecNVIDIA GeForce RTX 4090AMD Radeon RX 7900 XTX
GPUGeForce RTX 4090Radeon RX 7900 XTX
Memory24 GB GDDR6X24 GB GDDR6
Memory bus384-bit384-bit
Memory bandwidth1,008 GB/s960 GB/s
FP16 compute165 TFLOPS123 TFLOPS
SoftwareCUDAROCm
Board power450 W355 W
PCIe generationGen 4Gen 4
PCIe lanesx16x16

What each runs

Estimated decode speed with the most precise quant that fits each one est.

ModelNVIDIA GeForce RTX 4090AMD Radeon RX 7900 XTX
Gemma 4 26B-A4B68tok/sUD-Q4_K_M57tok/sUD-Q4_K_M
gpt-oss 20B66tok/sMXFP456tok/sMXFP4
Gemma 4 12B41tok/sQ8_035tok/sQ8_0
Qwen 3.5 9B45tok/sQ8_038tok/sQ8_0
Qwen 3.5 4B71tok/sQ8_060tok/sQ8_0
Ministral 3 8B27tok/sQ4_K_Moffload
Gemma 4 E4B52tok/sQ8_044tok/sQ8_0
LFM2.5 8B-A1B50tok/sQ8_042tok/sQ8_0
Llama 3.1 8B27tok/sQ5_K_M23tok/sQ5_K_M
Qwen 3.8 27Boffloadoffload
Qwen 3.5 122B-A10Boffloadoffload
Qwen 3.6 27Boffloadoffload
Gemma 4 31Boffloadoffload
Mistral Small 4 119Boffloadoffload
Qwen 3.6 35B-A3Boffloadoffload
Qwen 3.5 27Boffloadoffload
Qwen 3.5 35B-A3Boffloadoffload
GLM 4.7 Flashoffloadoffload
Devstral Small 2 24Boffloadoffload
Nemotron 3.5 Lightning 30B-A3Boffloadoffload
Kimi Linear 48B-A3Boffloadoffload
Qwen3 Coder 30B-A3Boffloadoffload
Gemma 3 27Boffloadoffload
Mistral Small 3.2 24Boffloadoffload
Ministral 3 14Boffloadoffload
Qwen3 14Boffloadoffload
DeepSeek R1 0528 Qwen3 8Boffloadoffload
Qwen3 8Boffloadoffload
Phi-4 14Boffloadoffload
Granite 4.2 8Boffloadoffload
DeepSeek V4 Flashwon't runwon't run
GLM 5.3 Flashwon't runwon't run
Qwen 3.8 Flash Nextwon't runwon't run
MiniMax M2.7won't runwon't run
Nemotron 3 Super 120B-A12Bwon't runwon't run
Qwen3 Coder Nextwon't runwon't run
gpt-oss 120Bwon't runwon't run
GLM 4.5 Airwon't runwon't run
Qwen3 Next 80B-A3Bwon't runwon't run
Qwen3 32Bwon't runwon't run
DeepSeek R1 Distill Qwen 32Bwon't runwon't run
Llama 3.3 70Bwon't runwon't run

Questions

Which is better for local AI, the NVIDIA GeForce RTX 4090 or the AMD Radeon RX 7900 XTX?
Choose the NVIDIA GeForce RTX 4090 to run bigger models. Choose the NVIDIA GeForce RTX 4090 for speed. Choose the AMD Radeon RX 7900 XTX to spend less.
Which can run bigger models, the NVIDIA GeForce RTX 4090 or the AMD Radeon RX 7900 XTX?
At 128k context the NVIDIA GeForce RTX 4090 runs 9 of the models we track fully in memory and the AMD Radeon RX 7900 XTX 8; only the NVIDIA GeForce RTX 4090 holds Ministral 3 8B.
Which is faster for local AI, the NVIDIA GeForce RTX 4090 or the AMD Radeon RX 7900 XTX?
On the models both run fully in memory, the NVIDIA GeForce RTX 4090 is about 1.2× as fast as the AMD Radeon RX 7900 XTX (estimated, median across models).
What is the price difference between the NVIDIA GeForce RTX 4090 and the AMD Radeon RX 7900 XTX?
In Germany the NVIDIA GeForce RTX 4090 costs 3.955 € at eBay and the AMD Radeon RX 7900 XTX 1.555 € at eBay: the AMD Radeon RX 7900 XTX is 2.400 € cheaper.

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