Can Yi 1.5 6B Chat run on NVIDIA DGX Spark 128GB?

YES — Runs Great

C43Usable

Estimated from fit model

Yi 1.5 6B Chat needs ~18.6 GB VRAM. NVIDIA DGX Spark 128GB has 108.8 GB. With Q4_K_M quantization, expect ~45 tok/s.

Runtime: OllamaCapacity: RoomyBandwidth: LowStack: BasicBottleneck: 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

Q4_K_M (Medium quality) — 18.6 GB, 44.8 tok/s, Runs well

18.6 GB required108.8 GB available

17% VRAM used

Fit status

Runs well

Decode

44.8 tok/s

TTFT

4326 ms

Safe context

2.1M

Memory

18.6 GB / 108.8 GB

Memory breakdown

Weights3.7 GB

KV Cache0.7 GB

Runtime1.2 GB

Headroom13.1 GB

See how fast it feels

See how fast it feelsYi 1.5 6B Chat on NVIDIA DGX Spark 128GB
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: 44.8 tok/s decode · 4.3s TTFT (warm) · 112 tok/s prefill

What limits this setup

This setup is broadly balanced for this model.

Shared-memory contention still exists

The OS, browser, and inference runtime all compete for the same physical memory pool, so real-world headroom is less forgiving than raw capacity suggests.

Best improvement path

Performance by workload

Workload	Grade	Fit	Decode	TTFT	Context
Chat	C	Runs well	44.8 tok/s	2360 ms	2.1M
Coding	C	Runs well	44.8 tok/s	4326 ms	2.1M
Agentic Coding	C	Runs well	44.8 tok/s	6292 ms	2.1M
Reasoning	C	Runs well	44.8 tok/s	5112 ms	2.1M
RAG	C	Runs well	44.8 tok/s	7865 ms	2.1M

Inference speed

Yi 1.5 6B Chat inference speed — tokens per second by GPU & Mac

Estimated decode speed (tokens/sec) for Yi 1.5 6B Chat at Q4_K_M across popular GPUs and Apple Silicon, using the fastest local runtime per device. Fastest is RTX 5090 32GB at ~114 tok/s. Speed is memory-bandwidth bound, so cards that fit the whole model in VRAM run far faster than ones that offload to system RAM.

GPU / Mac	Memory	Quant	Speed (tok/s)	Fits?
RTX 5090 32GB	32 GB	Q4_K_M	114.0	Fits
RTX 4090 24GB	24 GB	Q4_K_M	84.0	Fits
RTX 4080 Super 16GB	16 GB	Q4_K_M	84.0	Fits
RTX 3090 24GB	24 GB	Q4_K_M	84.0	Fits
RTX 4070 12GB	12 GB	Q4_K_M	84.0	Fits
RX 7900 XTX 24GB	24 GB	Q4_K_M	84.0	Fits
MacBook Pro M4 Max 128GB	128 GB	Q4_K_M	84.0	Fits
Mac Studio M3 Ultra 256GB	256 GB	Q4_K_M	84.0	Fits
Mac Studio M2 Ultra 128GB	128 GB	Q4_K_M	84.0	Fits
Mac Studio M1 Ultra 128GB	128 GB	Q4_K_M	84.0	Fits
MacBook Pro M4 Max 64GB	64 GB	Q4_K_M	84.0	Fits
MacBook Pro M3 Max 64GB	64 GB	Q4_K_M	65.6	Fits
RTX 3060 12GB	12 GB	Q4_K_M	64.9	Fits
MacBook Pro M1 Max 64GB	64 GB	Q4_K_M	60.1	Fits
RTX 4060 8GB	8 GB	Q4_K_M	54.3	Fits
MacBook Pro M4 Pro 48GB	48 GB	Q4_K_M	52.8	Fits

Estimates for single-stream decoding at Q4_K_M; real tokens/sec varies with prompt length, context, batch size, and runtime build. Prompt processing (prefill) is faster than the decode figures shown here.

Quantization options

How Yi 1.5 6B Chat (6B params) fits at each quantization level on NVIDIA DGX Spark 128GB (92.2 GB usable).

Quant	Bits	VRAM	Quality	Fit
Q2_K	2	2.3 GB	Low	D39
Q3_K_S	3	2.9 GB	Low	D39
NVFP4	4	3.4 GB	Medium	D39
Q4_K_M	4	3.7 GB	Medium	D39
Q5_K_M	5	4.3 GB	High	D39
Q6_K	6	4.9 GB	High	D39
Q8_0	8	6.4 GB	Very High	D39
F16Best for your GPU	16	12.3 GB	Maximum	D40

Get started

Copy-paste commands to run Yi 1.5 6B Chat on your machine.

Run

lms load hf-maziyarpanahi--yi-1-5-6b-chat-gguf && lms server start

Upgrade-Optionen

Hardware, die Yi 1.5 6B Chat gut ausführt

NVIDIA H200 141GBGünstige Wahl

141 GB VRAM (+13)4800 GB/s (+4527)

Raises estimated decode speed by about 88%.84 tok/s Dekodierung

Raises estimated decode speed by about 88%.

Adds memory headroom for longer context windows and future model growth.

ca. $30,000 MSRP

NVIDIA H200 PCIe 141GBBestes Preis-Leistungs-Verhältnis

141 GB VRAM (+13)4800 GB/s (+4527)

Raises estimated decode speed by about 88%.84 tok/s Dekodierung

Raises estimated decode speed by about 88%.

Adds memory headroom for longer context windows and future model growth.

ca. $30,000 MSRP

NVIDIA B200 180GBNVIDIA-Upgrade

180 GB VRAM (+52)8000 GB/s (+7727)

Raises estimated decode speed by about 88%.84 tok/s Dekodierung

Raises estimated decode speed by about 88%.

Adds memory headroom for longer context windows and future model growth.

ca. $30,000 MSRP

Frequently asked questions

Can NVIDIA DGX Spark 128GB run Yi 1.5 6B Chat?

Yes, NVIDIA DGX Spark 128GB can run Yi 1.5 6B Chat with a C grade (Runs well). Expected decode speed: 44.8 tok/s.

How much VRAM does Yi 1.5 6B Chat need?

Yi 1.5 6B Chat (6B parameters) requires approximately 18.6 GB of memory with Q4_K_M quantization.

What is the best quantization for Yi 1.5 6B Chat?

The recommended quantization for Yi 1.5 6B Chat is Q4_K_M, which balances quality and memory efficiency.

What speed will Yi 1.5 6B Chat run at on NVIDIA DGX Spark 128GB?

On NVIDIA DGX Spark 128GB, Yi 1.5 6B Chat achieves approximately 44.8 tokens per second decode speed with a time-to-first-token of 4326ms using Q4_K_M quantization.

Can NVIDIA DGX Spark 128GB run Yi 1.5 6B Chat for coding?

For coding workloads, Yi 1.5 6B Chat on NVIDIA DGX Spark 128GB receives a C grade with 44.8 tok/s and 2.1M context.

What context window can Yi 1.5 6B Chat use on NVIDIA DGX Spark 128GB?

On NVIDIA DGX Spark 128GB, Yi 1.5 6B Chat can safely use up to 2.1M tokens of context. The model's official context limit is —, but available memory constrains the safe maximum.

Is unified memory on NVIDIA DGX Spark 128GB as fast as VRAM for Yi 1.5 6B Chat?

Not always. NVIDIA DGX Spark 128GB can often fit larger models thanks to unified memory, but a discrete GPU with dedicated high-bandwidth VRAM may still decode faster once the model fits. For this combination, the important distinction is capacity versus sustained throughput.

See all results for NVIDIA DGX Spark 128GB See all hardware for Yi 1.5 6B Chat

Embed this result▼

Paste this snippet into any page to show a live fit card.

<iframe src="https://willitrunai.com/embed/hf-maziyarpanahi--yi-1-5-6b-chat-gguf-on-dgx-spark-128gb" width="400" height="180" frameborder="0" style="border:none;border-radius:12px;overflow:hidden;" title="Will It Run AI — fit result"></iframe>

Preview: