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NVIDIA DGX Spark In-Depth Review: A New Standard for Local AI Inference

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Re: NVIDIA DGX Spark In-Depth Review: A New Standard for Local AI Inference

#61
post #18

You guys that continue to compare DGX Spark to the Mac Studios, please remember two things: 1. Virtually every model that you'd run was developed on Nvidia gear and will run on Spark. 2. Spark has fast-as-hell interconnects. The sort of interconnects that one would want to use in an actual AI DC, so you can use more than one Spark at the same time, and RDMA, and actually start to figure out how things work the way th…

At best this is a cheap setup to test distributed training/inference code.

Re: NVIDIA DGX Spark In-Depth Review: A New Standard for Local AI Inference

#62
post #59
post #52

Earlier quoted context omitted.

A warning to any home consumer throwing money at hardware for AI (fair enough if you have other use cases)... Things are changing rapidly and there is a non insignificant chance that it'll seem like a big waste of money within 12 months.

For this form factor it will be likely ~2 years for the next one based on Vera CPU and whatever GPU. The 50W CPU will probably improve power efficiency. If SOCAMM2 is used it will still probably be at most near the range of 512/768 GB/s bandwidth, unless LPDDR6X / LPDDR7X or SOCAMM2 is that much better, SOCAMM on the DGX Station is just 384 GB/s w/ LPDDR5X. Form factor will be neutered for the near future, but will p…

Software driven changes could occur too! Maybe the next model will beat the pants off of this with far inferior hardware. Or maybe itll be so amazing with higher bandwidth hardware that anyone running at less than 500gbs will be left feeling foolish.

Maybe a company is working on something totally different in secret that we cant even imagine. The amount of £ thrown into this space at the moment is enormous.

Re: NVIDIA DGX Spark In-Depth Review: A New Standard for Local AI Inference

#64

Earlier quoted context omitted.

Something is wrong with your numbers: gpt-oss-20b and gpt-oss-120b should be much much faster than what you are seeing. I would suggest you familiarize yourself with llama-bench instead of ollama. Running gpt-oss-120b with a rtx 5090 and 2/3 of the experts offloaded to system RAM (less than half of the memory bandwidth of this thing), my machine gets ~4100tps prefill and ~40tps decode. Your spreadsheet shows the spar…

Your system RAM is probably 1/20th the VRAM bandwidth of the 5090 (way way less than half) unless you're running a workstation board with quad or 8 channel RAM, then it's only about 1/10th or 1/5th respectively.

I'm saying its less than half of this DGX Spark: dual channel DDR5-6000 vs quad channel LPDDR5-8000.

Re: NVIDIA DGX Spark In-Depth Review: A New Standard for Local AI Inference

#65
post #18

You guys that continue to compare DGX Spark to the Mac Studios, please remember two things: 1. Virtually every model that you'd run was developed on Nvidia gear and will run on Spark. 2. Spark has fast-as-hell interconnects. The sort of interconnects that one would want to use in an actual AI DC, so you can use more than one Spark at the same time, and RDMA, and actually start to figure out how things work the way th…

Also remember that the Mx Ultras have 2-3x the memory bandwidth. Looking at the benchmarks even Strix Halo seems to beat the Spark. Buying a 200 Gbps switch is $10k-$100k+ so don't imagine anyone actually will use the interconnect. The logical thing for Nvidia would be to sell a kit with three machines and cabling, and make it a ring with the dual ports per machine. Helps for some scenarios but not others with the 10 times slower network than memory bandwidth.

Re: NVIDIA DGX Spark In-Depth Review: A New Standard for Local AI Inference

#66
post #22

> ollama gpt-oss 120b mxfp4 1 94.67 11.66 This is insanely slow given its 200+GB/s memory bandwidth. As a comparison, I've tested GPT OSS 120B on Strix Halo and it obtains 420tps prefill and >40tps decode.

Probably the quants have higher perplexity, but the Sparks performance seems to be lack lustre. The reviewer videos I've seen so far tries their best not to offend Nvidia or, rather, not break their contracts.

Re: NVIDIA DGX Spark In-Depth Review: A New Standard for Local AI Inference

#67
post #8

Earlier quoted context omitted.

Hi, author here. I crowd-sourced the devices for benchmarking from my friends. It just happened that one of my friend has this device.

FYI you should have used llama.cpp to do the benchmarks. It performs almost 20x faster than ollama for the gpt-oss-120b model. Here are some samples results on my spark: ggml_cuda_init: found 1 CUDA devices: Device 0: NVIDIA GB10, compute capability 12.1, VMM: yes | model | size | params | backend | ngl | n_ubatch | fa | test | t/s | | ------------------------------ | ---------: | ---------: | ---------- | --: | ----…

Makes sense you have one of the boxes. What's your take on it? [Respecting any NDAs/etc/etc of course]

Re: NVIDIA DGX Spark In-Depth Review: A New Standard for Local AI Inference

#70

It isn't that good for local LLM inferencing. It's not designed to be as such. It's designed to be a local dev machine for Nvidia server products. It has the same software and hardware stack as enterprise Nvidia hardware. That's what it is designed for. Wait for M5 series Macs for good value local inferencing. I think the M5 Pro/Max are going to be very good values.

I wish I could run Linux on them (the m5)
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