400GbE is CHEAP Now MikroTik CRS812 DDQ Review

Published at : 23 Dec 2025

We review the low-power, relatively quiet, and cheap 400GbE, 200GbE, and 50GbE switch from MikroTik. The MikroTik CRS812-8DS-2DQ-2DDQ-RM or CRS812 DDQ is an awesome switch platform for those who want to go fast with a few systems.

STH Main Site Article: https://www.servethehome.com/mikrotik-achieves-400gbe-in-our-mikrotik-crs812-8ds-2dq-2ddq-rm-review-keysight-cyperf-arm-marvell/

Substack: https://axautikgroupllc.substack.com/
STH Top 5 Weekly Newsletter: https://eepurl.com/dryM09

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Join STH YouTube membership to support the channel: https://www.youtube.com/channel/UCv6J_jJa8GJqFwQNgNrMuww/join
Professional Users Substack: https://axautikgroupllc.substack.com/
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Where to Find The Unit We Purchased
Note we may earn a small commission if you use these links to purchase a product through them.
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MikroTik CRS812 DDQ (eBay seller): https://fave.co/3WPdscS
MikroTik CRS305: https://amzn.to/4nEfN6t
MikroTik CRS304: https://amzn.to/46xfsuJ
MikroTik CRS504: https://amzn.to/3KCMaDA
MikroTik CRS510: https://amzn.to/3Wd1YiV

STH Merch on Spring: https://the-sth-merch-shop.myteespring.co/

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Where to Find STH
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Other STH Content Mentioned in this Video
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- MikroTik Latvia Tour: https://youtu.be/lwQHRtrmmK8
- NVIDIA DGX Spark: https://youtu.be/rKOoOmIpK3I
- Our AI NAS for this: https://youtu.be/dfx_nJ9uyBw
- MikroTik RDS Server: https://youtu.be/lC0FrLmj2eE
- MikroTik 10" Switch: https://youtu.be/6CfdFRrwT5I
- MikroTik CRS304: https://youtu.be/8Zooc6soHJU
- MikroTik CRS305: https://www.servethehome.com/mikrotik-crs305-1g-4sin-review-4-port-must-have-10gbe-switch/
- MikroTik CRS504: https://youtu.be/UhBsroF78qg
- MikroTik CRS510: https://youtu.be/tU9z2NP2OCI
- 2024 2.5GbE Switch Guide: https://youtu.be/-pYQvEX9Ct0
- Updated Ultimate 2.5GbE Mega Round-up STH Main Site: https://www.servethehome.com/the-ultimate-cheap-2-5gbe-switch-mega-round-up-qnap-netgear-hasivo-mokerlink-trendnet-zyxel-tp-link/
- MikroTik CRS310-8G+2S-IN: https://youtu.be/P5JIGLm_jWQ
- MikroTik CSS610: https://youtu.be/Xh3oQKcMOmg
- MikroTik CRS504-4XQ-IN: https://youtu.be/UhBsroF78qg
- MikroTik CRS518-16XS-2XQ-RM Review: https://youtu.be/I4sUWO61VsU
- MikroTik CRS328-24P-4S+RM Review: https://youtu.be/XPzy7XOfp7M

More:
- MikroTik CRS812 DDQ: https://www.servethehome.com/mikrotik-crs812-ddq-400gbe-switch-launched-crs812-8ds-2dq-2ddq-marvell/
- Dell Pro Max with GB10: https://www.servethehome.com/dell-pro-max-with-gb10-unboxing-this-nvidia-gb10-arm-blackwell-ai-workstation/
- Dell Pro Max with GB10 short on the @STHLabs channel: https://youtube.com/shorts/zkc1OEOFMus

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Timestamps
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00:00 Introduction
01:31 - External Hardware Overview
03:39 - Internal Hardware Overview
04:40 - Power Consumption, Noise, and Software
07:30 - 400GbE Performance with Keysight CyPerf
08:52 - Key Lessons Learned
09:22 - MikroTik CRS812 DDQ List Pricing and Street Pricing
10:41 - Used 400GbE Switch Alternative with the Dell Z9332F-ON
11:17 - QSFP56-DD versus QSFP56
11:54 - 56G or 50G PAM4 Signaling versus NRZ
13:43 - OSFP versus QSFP-DD at 400GbE Speeds
15:05 - The Best Switch for Small NVIDIA DGX Spark and Dell GB10 AI Clusters?