Can Desktop PC · Radeon RX 7900 XT · 32 GB RAM run Muse Spark Open 816B-A42B?
20 GB VRAM + 32 GB RAM · 800 GB/s memory bandwidth · Muse Spark Open 816B-A42B has 816B parameters (42B active per token).
Short answer
No. It doesn't fit in memory.
Needs ≈411 GB but only ≈43 GB of VRAM + system RAM is available after the OS and other apps.
Why it doesn’t fit
Even its smallest practical version (MXFP4) needs about 411 GB for the model, its context memory and the runtime. After Windows (≈4.5 GB), a browser with a few tabs (≈3.0 GB) and Open WebUI (≈1.0 GB), Desktop PC · Radeon RX 7900 XT · 32 GB RAM has about 43 GB left, so it’s 369 GB short.
Ways to make it work
Close everything else
Not enough on its own: with every other app closed it’s still about 366 GB short.
Pick a smaller model from the same family
No smaller Muse Spark model in our catalog runs well here. See the other models below.
Get more memory
You’d want at least 420 GB of VRAM plus RAM in total. The machines below are the cheapest that run it comfortably.
Check your exact setup
These pages assume typical settings. A shorter context or a lighter chat app can change the answer.
Check Desktop PC · Radeon RX 7900 XT · 32 GB RAM
The same applies to every workload we rate (chat, coding questions, coding in a repository, agentic coding and long documents): they all need at least as much memory as chat.
Other models for Desktop PC · Radeon RX 7900 XT · 32 GB RAM
The best-rated models for chat on this machine.
- LFM2.5 24B-A2B240–410 tok/sExcellent
- gpt-oss-20b150–240 tok/sExcellent
- Gemma 4 26B-A4B120–200 tok/sExcellent
- Qwen3.6 35B-A3B200–340 tok/sExcellent
- Qwen3.8 27B25–40 tok/sExcellent
- Qwen3.5 35B-A3B200–340 tok/sExcellent
Cheapest machines for Muse Spark Open 816B-A42B
Hardware rated comfortable or better for chat, lowest price first.
Different tool, context size or workload?
These pages use typical settings. The full check models your exact setup.