Dell PowerSwitch S5248F-ON vs Z9432F-ON
Dell PowerSwitch S5248F-ON
Dell PowerSwitch Z9432F-ON
Both of these are Dell PowerSwitch "-ON" open-networking switches in a compact 1RU form factor, but they sit at different layers of the data center fabric, so this is a question of role rather than which switch is "better." The S5248F-ON is a top-of-rack (ToR) / leaf switch built to aggregate 25GbE and 10GbE server and storage connectivity, with 100/200GbE uplinks back into the fabric. The Z9432F-ON is a 400GbE spine / aggregation switch designed to interconnect those leaf switches at very high bandwidth and low latency. In a classic leaf-spine design you would typically deploy S5248F-ON switches in the racks and Z9432F-ON switches as the spine that ties them together — they are complementary far more often than they are direct alternatives. Both share Dell's SmartFabric OS10 software story and ONIE-based open networking, so they manage and automate in a consistent way. This page lays out where each one fits so you can size the right layer for your build.
Side by side
| Dell PowerSwitch S5248F-ON | Dell PowerSwitch Z9432F-ON | |
|---|---|---|
| Primary role | Top-of-rack / leaf switch for 25GbE and 10GbE compute and storage access | Spine / aggregation switch interconnecting leaf switches at 400GbE |
| Port configuration | 48x 25GbE SFP28 access ports plus high-speed uplinks (4x 100GbE QSFP28 and 2x 200GbE QSFP28-DD) | 32x 400GbE QSFP56-DD multi-rate ports, plus SFP+ management/console ports |
| Port flexibility / breakout | 25GbE SFP28 access with SFP28/SFP+ also supporting 10GbE; 100/200GbE QSFP uplinks | Multi-rate 400GbE ports break out to roughly 128x 100GbE or up to 144x 10/25/50GbE, plus native 400/200/100GbE |
| Switching capacity | 2.0 Tbps switching fabric (4.0 Tbps full-duplex), non-blocking line rate | 25.6 Tbps non-blocking (full-duplex) switching fabric with sub-microsecond latency |
| Form factor | 1RU fixed switch | 1RU fixed switch |
| Software / OS | Open Networking (ONIE); Dell SmartFabric OS10 and supported third-party network operating systems | Open Networking (ONIE); Dell SmartFabric OS10 and Enterprise SONiC Distribution by Dell, plus supported alternatives |
| Airflow & redundancy | Reversible airflow (front-to-back or back-to-front) with redundant, hot-swappable PSUs and fans | Reversible airflow for hot/cold aisle, with redundant, hot-swappable PSUs and fans |
| Where it sits in the fabric | In the rack, facing servers and storage | At the core/spine, facing the leaf switches |
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Dell PowerSwitch S5248F-ON
Dell PowerSwitch Z9432F-ON
Choose the S5248F-ON for high-density server and storage access
Pick the S5248F-ON when your need is rack-level connectivity: you have servers and storage arrays that terminate on 25GbE (or 10GbE) and you want a dense, line-rate ToR or leaf switch to bring them into the fabric. Its 48 SFP28 ports give you ample 25GbE access in 1RU, while the 100GbE and 200GbE QSFP uplinks provide plenty of headroom to hand traffic up to a spine. It is the right tool for the access layer in a leaf-spine design, for storage-facing racks, and for environments standardizing on 25GbE compute. If you are buying switches to put at the top of each rack, this is the model you want — and you would size the number of units to your rack count, not buy a single spine-class box.
Choose the Z9432F-ON for 400GbE spine and high-bandwidth aggregation
Pick the Z9432F-ON when you need to interconnect many leaf switches or high-bandwidth nodes at the core of the fabric. With 32 ports of 400GbE and a 25.6 Tbps non-blocking fabric at sub-microsecond latency, it is built to be the spine that S5248F-ON (or similar) leaf switches uplink into. Its multi-rate ports and breakout flexibility (to 100/50/25/10GbE) also make it a strong aggregation switch or a high-radix leaf for very dense 100GbE GPU/AI and HPC racks. It also supports Enterprise SONiC Distribution by Dell in addition to OS10, which matters for hyperscale-style or SONiC-standardized environments. Choose it when bandwidth between switches — not server port count — is the constraint you are solving.
These two are best understood as partners rather than competitors. The S5248F-ON is the 25/100G top-of-rack workhorse that connects your servers and storage; the Z9432F-ON is the 400G spine that ties those racks together with massive non-blocking bandwidth and very low latency. For most data centers the answer is "both, at different layers": deploy S5248F-ON switches in the racks and Z9432F-ON switches as the spine. If you are buying for a single layer, let the workload decide — 25GbE/10GbE server and storage access points to the S5248F-ON, while 400GbE inter-switch bandwidth, AI/HPC fabrics, or high-radix 100GbE aggregation points to the Z9432F-ON. Because both run Dell SmartFabric OS10 and follow the open-networking (ONIE) model, mixing them in one fabric keeps your operations and automation consistent. As your Dell partner, Uniqcli can help you size leaf and spine port counts, oversubscription ratios, and optics together so the two layers are matched rather than guessed.
Talk to a specialistFrequently asked
Can the S5248F-ON and Z9432F-ON be used together in the same network?
Yes, and that is the most common deployment. In a leaf-spine architecture the S5248F-ON acts as the leaf (top-of-rack) switch connecting servers and storage, and its 100GbE/200GbE uplinks connect up to a Z9432F-ON acting as the 400GbE spine. Both run Dell SmartFabric OS10 and support open networking, so they integrate cleanly and are managed and automated in a consistent way. Uniqcli can help match leaf and spine port counts and optics for your design.
Is the Z9432F-ON just a faster version of the S5248F-ON?
No — they are designed for different layers of the fabric, not as a slow-vs-fast pair of the same thing. The S5248F-ON is optimized for dense 25GbE/10GbE server and storage access with 100/200GbE uplinks, while the Z9432F-ON is a 400GbE spine/aggregation switch with a 25.6 Tbps non-blocking fabric meant to interconnect switches. The Z9432F-ON can be broken out to lower speeds and used as a high-radix leaf, but it is overbuilt (and priced) for ordinary rack access where the S5248F-ON is the better fit.
Which one should I buy if I'm building an AI or GPU cluster?
It depends on the layer and the NIC speeds in your nodes. The Z9432F-ON is the stronger choice for the high-bandwidth fabric between GPU servers and for the spine, thanks to its 400GbE ports, very high switching capacity, and sub-microsecond latency; its breakout flexibility also supports dense 100GbE node connectivity. The S5248F-ON remains a good fit for 25GbE/10GbE management, storage, or general-purpose racks alongside the cluster. Many AI builds use both. Share your node count, NIC speed, and target oversubscription with Uniqcli and we can spec the right mix.
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