Can I run it?
Can I run Qwen3.8 Flash Next on GeForce RTX 4070?
Won't fit
Won't fit on GeForce RTX 4070. The smallest quant UD-IQ1_S is 67.6 GB before KV cache, and usable memory is 10.9 GB.
Best quantUD-IQ1_S
Working context—
Max that fits—
Speed—Estimate from memory bandwidth, not a benchmark. Method.
Weights67.6 GB
KV cache0.00 GB
Total0.00 GB
Usable10.9 GB
Qwen3.8 Flash Next details · GeForce RTX 4070 page · How this estimate is made
Run commands
llama.cpp
llama-server -hf unsloth/Qwen3.8-Flash-Next-GGUF:UD-IQ1_S -c 2048 -ngl 0
Ollama
ollama run qwen3.8-flash-next
LM Studio
lms get unsloth/Qwen3.8-Flash-Next-GGUF # Then load quant UD-IQ1_S
Assumptions
- Estimate from memory bandwidth, not a benchmark. Decode speed uses 55–75% of peak bandwidth.
- KV cache is FP16. Engine overhead assumes llama.cpp (0.3 GB + 1% of the weights). Ollama is closer to 0.9 GB + 3%, LM Studio closer to 1 GB + 3%.
- 0.5 GB is reserved because the GPU also drives a display, then 5% is left free.
- Usable memory for this profile is 10.9 GB.
Models that fit this machine more comfortably
- Can I run Qwen3.6 35B A3B on GeForce RTX 4070? — Heavily degraded, UD-IQ2_XXS, 61–83 tok/s (estimate)
- Can I run Qwen3.5 35B A3B on GeForce RTX 4070? — Heavily degraded, UD-IQ2_XXS, 62–84 tok/s (estimate)
- Can I run Kwaipilot KAT Coder V2.5 Dev on GeForce RTX 4070? — Heavily degraded, IQ2_XXS, 67–91 tok/s (estimate)
Updated 2026-10-24. Profile on this page is the device default plus 32 GB of DDR5-5600 system RAM.