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Can the AMD Radeon RX 7900 XT run Mixtral 8x7B?

Radeon RX 7900 XT × Mixtral 8x7B8K context
Yes, with heavy quantizationFits only at a low-quality quant
Memory at Q2_K19.2 GB of 20 GB
Weights 17.5 GBKV cache 1.1 GBRuntime 0.6 GB
QuantQ2_KHeavily degraded
Speed~99tokens per second
Max context13Ktokens that fit at Q2_K
  1. FP16
  2. Q8_0
  3. Q6_K
  4. Q5_K_M
  5. Q4_K_M
  6. Q3_K_M
  7. Q2_K

Only just. Mixtral 8x7B fits on the AMD Radeon RX 7900 XT at Q2_K, which costs noticeable quality. Expect about 99 tokens/second. A card with more memory is a better experience.

Try other context lengths

Run it with Ollama

Ollama's default mixtral:8x7b download is Q4_K_M, which needs about 30 GB, more than the 20 GB available. Download the Q2_K GGUF instead (LM Studio lists quants per model), or try a smaller context length.

New to this? Step-by-step setup for the Radeon RX 7900 XT

Run it in the cloud

Want full quality? Run Mixtral 8x7B on a bigger rented GPU.

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Memory needed by quantization

At 8,192 tokens of context. The black line marks the 20 GB the AMD Radeon RX 7900 XT can use.

QuantQualityMemoryFits?Speed
FP16Full quality95.1 GBToo big—
Q8_0Near-lossless51.3 GBToo big—
Q6_KExcellent40 GBToo big—
Q5_K_MVery good34.9 GBToo big—
Q4_K_MGood, most popular30 GBToo big—
Q3_K_MNoticeably degraded24.5 GBToo big—
Q2_KHeavily degraded19.2 GBFits~99 tok/s

Measured speed from real Radeon RX 7900 XT owners

Tokens per second that people measured on their own AMD Radeon RX 7900 XT, next to our estimate.

No one has measured Mixtral 8x7B on the AMD Radeon RX 7900 XT yet. The speeds above are estimates. Run the benchmark and yours becomes the first real number on this page.

Have a Radeon RX 7900 XT? Add your real speed

One command times Mixtral 8x7B in your own Ollama, shows you exactly what it would send, and asks before sending anything. No sign-up, no personal data.

macOS and Linux

curl -fsSL https://gpufit.dev/bench.sh | sh -s -- mixtral:8x7b

Windows (PowerShell)

$env:GPUFIT_MODEL="mixtral:8x7b"; irm https://gpufit.dev/bench.ps1 | iex

How the benchmark works

GPUs that run Mixtral 8x7B comfortably

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Models that run well on the AMD Radeon RX 7900 XT

Frequently asked questions

Can AMD Radeon RX 7900 XT run Mixtral 8x7B?

Only just. Mixtral 8x7B fits on the AMD Radeon RX 7900 XT at Q2_K, which costs noticeable quality. Expect about 99 tokens/second. A card with more memory is a better experience.

How much VRAM does Mixtral 8x7B need?

About 30 GB at Q4_K_M with 8,192 tokens of context, and about 95.1 GB at full FP16 precision.

How fast is Mixtral 8x7B on the AMD Radeon RX 7900 XT?

Roughly 99 tokens per second at Q2_K, estimated from the AMD Radeon RX 7900 XT's 800 GB/s memory bandwidth.