ThinkSystem ST550
Two-socket tower for offices without a rack that need a proper virtualization host.
The ThinkSystem ST550 is a legacy model past vendor sales, usually out of warranty but still serviceable. Two-socket tower for offices without a rack that need a proper virtualization host.
Platform facts
| Vendor | Lenovo |
|---|---|
| Generation | Gen 1 |
| Family | ThinkSystem |
| Form factor | 4U tower (rack convertible) |
| Sockets | 2 |
| CPU | 1st/2nd Gen Intel Xeon Scalable |
| DIMM slots | 12 |
| Memory | DDR4 RDIMM |
| Storage | Up to 8x 3.5-inch or 20x 2.5-inch hot-swap SAS/SATA, up to 4x NVMe, M.2 boot |
| RAID | ThinkSystem RAID 530-8i / 730-8i / 930-8i / 930-16i |
| Management | XClarity Controller (XCC) |
| Released | 2017 |
| Status | legacy |
Field notes
Twelve DIMMs total is the main limit. Typical failures are RAID supercaps and dust-clogged front filters in office environments. Firmware via XCC or UpdateXpress. ESXi 7 target; the ST650 V3 is the current two-socket tower.
Successor: ThinkSystem ST650 V2.
What we do with the ThinkSystem ST550
- Specification and procurement of ThinkSystem servers
- Rack installation, XCC setup and UEFI/firmware baseline
- Memory, NVMe and RAID upgrades with qualified parts
- Out-of-warranty repair and spare sourcing for System x and ThinkServer
- OS and hypervisor installs
- Lenovo support case handling and refresh planning
Keep it or replace it?
A ThinkSystem ST550 can keep doing a single job for years if it has good backups, current firmware and spare parts on the shelf. It should not be the only copy of anything, and it should not be internet-facing on an unsupported OS. We will tell you honestly whether a memory or disk upgrade buys useful time or whether the money belongs in a replacement.
Replacement planning covers the OS and licences, not only the box: a ThinkSystem ST550 running Windows Server 2012 or an old ESXi needs a migration plan, not a lift-and-shift.
Related models
Related services
Frequently asked questions
Is Lenovo a good alternative to Dell?
Yes. ThinkSystem servers are equally reliable, often priced sharply, and XClarity management is mature. We support both and recommend whichever fits the existing fleet.
Can you still service System x servers?
Yes. System x M5 and X6 systems are legacy but parts are available and we keep them running while planning a replacement.
Can the ThinkSystem ST550 run a current operating system?
Check the field notes above. As a rule, current models are certified for Windows Server 2022/2025, ESXi 8 and RHEL 9; legacy models usually stop at Windows Server 2019 or ESXi 7 and may need Proxmox or an older Linux to stay useful.
Need a hand with this?
Tell us what you are running and what is slowing you down. You get a straight assessment and a plan, with no obligation. Support desk is staffed 24/7.