At NVIDIA GTC 2025, we had the chance to see the NVIDIA GB300 NVLink Switch tray. This is the liquid-cooled switch tray that is found between the GB300 compute blades. Unlike many switches today, these are liquid-cooled to fit in the NVL72 racks.
NVIDIA GB300 NVLink Switch Tray at NVIDIA GTC 2025
Here is the GB300 NVLink Switch tray. You can see the handles at the front and then the liquid cooling nozzles at the rear, busbar power, and the connectors for the four NVLink cable cartridges.
Something very neat about the design is that the NVLink switch chips are liquid cooled, but they are not the only liquid cooled components.
Here are the coldplates for the NVLink Switch portion. The actual NVLink Switch PCB is relativley short compared to the depth of the chassis.
Here we can see the power distribution.
In today’s mainstream liquid cooled servers, there are many rubber hoses. In this design, there are mostly metal tubes. Tha is a small feature, but one that differentiates the design.
On the bottom, we see some of the control components, that includes a M.2 SSD.
NVIDIA generally blacked out many of the other logos on its GTC 2025 floor models, but we can see two Marvell 88E1514’s and the Lattice LCMXO3D-9400HC.
Final Words
This is just a cool look at the NVLink Switch trays that will be populating the newer GB300 NVL72 racks that we will see more of later this year. Right now most of the market is still producing and consuming the GB200 NVL72 racks. Still, NVIDIA’s commitment to liquid cooling is a hallmark of this generation, and is only going to accelerate as we move to the Rubin era.
Hi John,Good afternoon!
A Chinese media outlet named Link 1+1 has translated your article and published it on the WeChat social platform, labeling it as ‘original’ with the byline Eric747 (Link 1+1). Did this operation receive your authorization?