Can Qwen3.5 122B A10B run on NVIDIA A800 80GB?

Q: What should I upgrade first if Qwen3.5 122B A10B feels slow on NVIDIA A800 80GB?

Buy headroom, not only minimum fit. A slightly larger memory tier gives you safer context growth and makes the recommendation more future-proof.

YES — With Offload

C49Usable

Estimated from fit model

Qwen3.5 122B A10B needs ~83.0 GB VRAM. NVIDIA A800 80GB has 80.0 GB. With Q3_K_M quantization, expect ~19 tok/s.

Runtime: llama.cppCapacity: OffloadBandwidth: HighStack: StandardBottleneck: Balanced

Operating mode

Choose the run profile you care about

Interactive favors responsiveness, while light API and scale-out lean harder on serving readiness. The fit stays the same, but the recommendation lens changes.

Current mode

Balanced

Balanced for general local use. Keeps the ranking neutral across personal and serving workflows.

Capabilities:

Select quantization to explore

F16 (Maximum quality) — 273.3 GB, exceeds 80.0 GB available

273.3 GB required80.0 GB available

342% VRAM needed

193.3 GB over capacity — needs offload or smaller quantization

Fit status

Too heavy

Decode

2.0 tok/s

TTFT

96800 ms

Safe context

Memory

273.3 GB / 80.0 GB

Offload

70%

Memory breakdown

Weights250.1 GB

KV Cache14.3 GB

Runtime0.9 GB

Headroom8.0 GB

See how fast it feels

With memory offload — actual speed may be lower

See how fast it feelsQwen3.5 122B A10B on NVIDIA A800 80GB
1st promptCold start — includes initialization
>What is local AI inference?
Local AI inference means running an AI language model directly on your own hardware — your laptop, desktop, or server — instead of sending requests to a remote cloud API.

When you run inference locally the model weights are loaded into your GPU or unified memory. Each token you generate requires reading those weights from memory, so memory bandwidth is the main bottleneck for decode speed.

Key benefits of running locally:
  - Full privacy: your prompts never leave your machine
  - No per-token cost or rate limits
  - Works offline once the model is downloaded
  - Latency depends only on your hardware
2nd promptWarm — model ready, no init overhead
>How much VRAM do I need?
It depends on the model size and quantization level. A rough rule of thumb:

  Model size     Q4 (4-bit)    Q8 (8-bit)    FP16
  7B params      ~4.3 GB       ~7.5 GB       ~14 GB
  13B params     ~7.9 GB       ~13.9 GB      ~26 GB
  70B params     ~42.7 GB      ~74.9 GB      ~140 GB

Most people use 4-bit quantization (Q4_K_M) which gives 90-95% of full quality at a fraction of the memory. A 24 GB GPU can comfortably run most 7B-13B models.
Estimated: 2.0 tok/s decode · 96.8s TTFT (warm) · 5 tok/s prefill

What limits this setup

This setup is broadly balanced for this model.

Very little memory headroom

You can run the model, but there is not much room left for longer context, bigger batches, extra apps, or future model updates.

Best improvement path

Buy headroom, not only minimum fit

A slightly larger memory tier gives you safer context growth and makes the recommendation more future-proof.

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	C	Tight fit	23.5 tok/s	4497 ms	13K
Coding	C	Runs with offload (needs ~2.1 GB host RAM)	18.9 tok/s	10267 ms	13K
Agentic Coding	F	Too heavy	14.5 tok/s	19414 ms	13K
Reasoning	C	Runs with offload (needs ~2.1 GB host RAM)	18.9 tok/s	12134 ms	13K
RAG	F	Too heavy	14.5 tok/s	24267 ms

Quantization options

How Qwen3.5 122B A10B (122B params) fits at each quantization level on NVIDIA A800 80GB (80.0 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	47.6 GB	Low	C48
Q3_K_SBest for your GPU	3	59.8 GB	Low	C48

Get started

Copy-paste commands to run Qwen3.5 122B A10B on your machine.

Run

docker run --rm -it ghcr.io/ggerganov/llama.cpp:full \
  --hf-repo "unsloth/Qwen3.5-122B-A10B-GGUF" \
  --hf-file "Qwen3.5-122B-A10B-GGUF-Q3_K_M.gguf" \
  -c 4096 -ngl 99

Upgrade options

Hardware that runs Qwen3.5 122B A10B well

RTX PRO 6000 Blackwell Workstation Edition 96GBBudget pick

96 GB VRAM (+16)

This setup is broadly balanced for this model.23.4 tok/s decode

~$9,999 MSRP

RTX PRO 6000 Blackwell Server Edition 96GBBest value

96 GB VRAM (+16)

This setup is broadly balanced for this model.20.9 tok/s decode

~$9,999 MSRP

NVIDIA H20 96GBNVIDIA upgrade

96 GB VRAM (+16)4000 GB/s (+2065)

Raises estimated decode speed by about 167%.50.4 tok/s decode

Raises estimated decode speed by about 167%.

~$12,000 MSRP

Frequently asked questions

Can NVIDIA A800 80GB run Qwen3.5 122B A10B?

Yes, NVIDIA A800 80GB can run Qwen3.5 122B A10B with a C grade (Runs with offload (needs ~2.1 GB host RAM)). Expected decode speed: 18.9 tok/s.

How much VRAM does Qwen3.5 122B A10B need?

Qwen3.5 122B A10B (122B parameters) requires approximately 83.0 GB of memory with Q3_K_M quantization.

What is the best quantization for Qwen3.5 122B A10B?

The recommended quantization for Qwen3.5 122B A10B is Q3_K_M, which balances quality and memory efficiency.

What speed will Qwen3.5 122B A10B run at on NVIDIA A800 80GB?

On NVIDIA A800 80GB, Qwen3.5 122B A10B achieves approximately 18.9 tokens per second decode speed with a time-to-first-token of 10267ms using Q3_K_M quantization.

Can NVIDIA A800 80GB run Qwen3.5 122B A10B for coding?

For coding workloads, Qwen3.5 122B A10B on NVIDIA A800 80GB receives a C grade with 18.9 tok/s and 13K context.

What context window can Qwen3.5 122B A10B use on NVIDIA A800 80GB?

On NVIDIA A800 80GB, Qwen3.5 122B A10B can safely use up to 13K tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.

What should I upgrade first if Qwen3.5 122B A10B feels slow on NVIDIA A800 80GB?

See all results for NVIDIA A800 80GB See all hardware for Qwen3.5 122B A10B

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