Lenovo ThinkSystem ST550
The ThinkSystem ST550 was Lenovo's versatile 4U two-socket tower server engineered for branch offices, retail locations, distributed enterprises, and remote business environments without dedicated server rooms. Powered by 1st and 2nd Generation Intel Xeon Scalable processors, it featured acoustic dampening for quiet desk-side operation, optional 4U rack-mount conversion kits, and support for up to 16 SFF or 8 LFF storage drives with AnyBay NVMe capabilities. Dual integrated Gigabit Ethernet and XClarity Controller enabled easy remote administration. In the used hardware market, the ST550 is popular among SMBs and home lab enthusiasts. Buyers should verify if the unit has the tower foot pedestals or rack rail kit, and confirm hot-swap PSU support.
Also written as: ThinkSystem ST550, ST550 Tower, 7X09, 7X10
Specifications
| Brand | Lenovo |
|---|---|
| Family | ThinkSystem ST |
| Form factor | tower |
| Released | Jul 2017 |
| End of sale | Dec 2022 |
| Cpu sockets | 2 |
| Cpu platform | Intel Xeon Scalable 1st Gen (Skylake-SP) and 2nd Gen (Cascade Lake-SP) up to 125W TDP |
| Memory slots | 12 |
| Memory type | DDR4-2666 / DDR4-2933 RDIMM / LRDIMM |
| Memory max (GB) | 768 |
| Drive bays | Up to 16x 2.5-inch SFF hot-swap bays (supporting up to 4 AnyBay NVMe bays) or 8x 3.5-inch LFF bays |
| Pcie slots | Up to 6 PCIe 3.0 slots |
| Gpu support | Up to 2 single-wide or 1 double-wide GPU adapter |
| Network onboard | Dual integrated 1GbE RJ-45 ports plus dedicated 1GbE XClarity management port |
| Power supply | Fixed 450W PSU or dual redundant 550W / 750W / 1100W AC 80 PLUS Platinum hot-swap PSUs |
Generations
- Next generation: Lenovo ThinkSystem ST650 V2
Reference prices (last 14 days, updated 2026-10-27)
Refurbished: USD 1,150 (1 sighting, Oct 2026)
Used: USD 680 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| ebay.com | used | USD 680 | 1x Xeon Silver 4110, 32GB DDR4, 8x 3.5 LFF bays, dual 750W PSUs | 2026-10-27 |
| serversupply.com | refurbished | USD 1,150 | 2x Xeon Silver 4210, 64GB RAM, 8-bay chassis refurbished with warranty | 2026-10-27 |
Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.
Compatible parts
Memory
- 4X77A08633 ThinkSystem 32GB TruDDR4 2933MHz (2Rx4 1.2V) RDIMM
RAID controllers
- 7Y37A01082 Lenovo ThinkSystem RAID 530-8i PCIe 12Gb Adapter
- 7Y37A01084 ThinkSystem RAID 930-8i 2GB Flash PCIe 12Gb Adapter
- 7Y37A01087 Lenovo ThinkSystem RAID 930-8e 4GB Flash PCIe 12Gb Adapter
HBAs
- 7Y37A01088 Lenovo ThinkSystem 430-8i SAS/SATA 12Gb HBA
Network adapters
- 7ZT7A00484 Lenovo ThinkSystem Broadcom 5719 1GbE RJ45 4-Port PCIe Ethernet Adapter
- 7ZT7A00535 Lenovo ThinkSystem Intel I350 1GbE RJ45 4-Port PCIe Ethernet Adapter
SSDs
- 4XB7A17128 ThinkSystem 2.5" S4620 3.84TB Mixed Use SATA 6Gb HS SSD
Hard drives
- 4XB7A13911 ThinkSystem 3.5" 14TB 7.2K SAS 12Gb Hot Swap 512e HDD
Equivalent models from other brands
- Dell Poweredge T440
- HPE ProLiant ML350 Gen10 · compare
Buying a used ST550: what to check
Confirm chassis configuration (pedestal feet for tower use vs rack conversion kit with slide rails), verify power supply type (entry fixed 450W vs dual redundant hot-swap), check XCC licensing, and inspect drive backplanes for SATA, SAS, or NVMe cabling.
FAQ
Can the ThinkSystem ST550 be mounted in a standard server rack?
Yes, using Lenovo's official 4U Tower-to-Rack conversion kit, the ST550 converts into a standard 4U rack server.
What processors are supported in the ST550?
It supports 1st and 2nd Gen Intel Xeon Scalable processors (Bronze, Silver, Gold) with thermal limits up to 125W TDP.
Is the ST550 quiet enough for office environments?
Yes, it incorporates low-noise cooling fans and thermal acoustic tuning, operating below 29 dBA in typical office setups.
Buying or selling ST550?
New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.
Sources
- Lenovo ThinkSystem ST550 Server Product Guide, checked 2026-10-27