The Ultimate DGX Spark Switch Guide

If you want to connect more than 3 DGX Sparks in a cluster, you’ll need a switch. Here’s a short, straight-to-the-point guide to choosing the right switch for your DGX Sparks cluster ✨

MikroTik CRS504

Planning only up to 4 DGX Sparks? Get the CRS504. Yes, it’s only 100GbE, but real-user reports show it delivers about 98% of the performance of much bigger and more expensive switches.

Retail: ~$759

MikroTik CRS804

Planning more than 4 Sparks or want to future-proof? Get the CRS804.

The CRS804 doesn’t natively have 8x 200G ports. Instead, it features four massive 400G QSFP56-DD ports. To connect 8 DGX Sparks at 200G, you must use breakout cables to split each 400G port into two 200G connections (4 ports × 2 = 8 nodes)

MikroTik CRS812

If you can’t find a CRS804 in stock, go with the CRS812.

To hook up 8 nodes to this switch, you would have to break down one of your 400G QSFP ports into four 100G links. This means you would end up with four nodes at 200G and four nodes at 100G**.**

Both CRS804 and CRS812 retail for ~$1,200

Real users who use a switch to connect 8x DGX Sparks

Here’s some actual users who run 8x DGX Spark clusters:

llmwish.open@ciprianveg·Jul 26GLM-5.2 can see now - 8× GB10 DGX Spark. Full instructions: https://github.com/ciprianveg/gb10-glm-5.2/tree/master/v18-vision… Prebuilt image: http://ghcr.io/ciprianveg/gb10-glm-5.2:v18-vision…

Credits: @MiaAI_lab (CosmicRaisins), https://huggingface.co/baseten https://huggingface.co/aidendle94 — the vision model ,overlay, adaptive MTP docker pull58826.2K

Takuya KAWATSU@takuz0_·Aug 1Testing 8x DGX Spark nodes in an open world setup :)373136447K

Gumbii.Digital@GumbiiDigital·Jul 25Just dropped the full thermal management write-up for the open-rack 8x DGX Spark cluster.

Left the rack open on purpose while I was still iterating. That created a heat pocket from the PSU bricks and cable loops sitting on the shelves.

Designed and 3D-printed custom supportsShow more211512810K