Lenovo ThinkSystem SR850
The ThinkSystem SR850 was Lenovo's dense 2U four-socket enterprise rack server designed for in-memory databases (SAP HANA), heavy virtualization, and mission-critical enterprise resource planning (ERP). Utilizing an innovative two-to-four processor mezzanine tray architecture, it allowed customers to deploy a 2-socket base system and scale seamlessly to 4 sockets and 48 DDR4 DIMM slots without expanding rack footprint. Supporting up to 6TB of memory and 16 SFF drive bays, it matched the compute density of larger 4U systems in half the space. Used market buyers should verify that the processor mezzanine tray and UPI interconnect connectors are undamaged, check XClarity licensing, and confirm matching four-way processor steppings.
Also written as: ThinkSystem SR850, SR850 Gen1, 7X18, 7X19
Specifications
| Brand | Lenovo |
|---|---|
| Family | ThinkSystem SR |
| Form factor | 2U rack |
| Released | Jul 2017 |
| End of sale | Dec 2021 |
| Cpu sockets | 4 |
| Cpu platform | Up to 4 Intel Xeon Scalable 1st Gen (Skylake-SP) or 2nd Gen (Cascade Lake-SP) processors up to 205W TDP |
| Memory slots | 48 |
| Memory type | DDR4-2666 / DDR4-2933 RDIMM / LRDIMM |
| Memory max (GB) | 6,144 |
| Drive bays | Up to 16x 2.5-inch SFF hot-swap bays (supporting up to 8 NVMe AnyBay drives) |
| Pcie slots | Up to 8 PCIe 3.0 slots plus dedicated LOM slot |
| Network onboard | Modular LOM slot (1GbE/10GbE) plus dedicated 1GbE XClarity management port |
| Power supply | Dual redundant 1100W / 1600W / 2000W AC 80 PLUS Platinum hot-swap power supplies |
Generations
- Next generation: Lenovo ThinkSystem SR850 V2
Reference prices (last 14 days, updated 2026-10-27)
Refurbished: USD 4,200 (1 sighting, Oct 2026)
Used: USD 2,400 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| ebay.com | used | USD 2,400 | 4x Xeon Gold 6140 18-core, 128GB DDR4, 8x 2.5 bays, dual 1600W PSUs | 2026-10-27 |
| serversupply.com | refurbished | USD 4,200 | 4x Xeon Gold 6248, 256GB RAM, 16-bay chassis refurbished | 2026-10-27 |
Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.
Compatible parts
Memory
- 4X77A08631 Lenovo ThinkSystem 16GB TruDDR4 2933MHz (1Rx4 1.2V) RDIMM
- 4X77A08633 ThinkSystem 32GB TruDDR4 2933MHz (2Rx4 1.2V) RDIMM
- 4X77A08635 Lenovo ThinkSystem 64GB TruDDR4 2933MHz (2Rx4 1.2V) RDIMM
Network adapters
- 7XC7A05523 Lenovo ThinkSystem Intel X710-DA2 PCIe 10Gb 2-Port SFP+ Ethernet Adapter
RAID controllers
- 7Y37A01082 Lenovo ThinkSystem RAID 530-8i PCIe 12Gb Adapter
- 7Y37A01084 ThinkSystem RAID 930-8i 2GB Flash PCIe 12Gb Adapter
- 7Y37A01085 Lenovo ThinkSystem RAID 930-16i 4GB 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
- 7Y37A01089 Lenovo ThinkSystem 430-16i SAS/SATA 12Gb HBA
SSDs
- 4XB7A17128 ThinkSystem 2.5" S4620 3.84TB Mixed Use SATA 6Gb HS SSD
Equivalent models from other brands
- Dell Poweredge R840
- HPE ProLiant DL560 Gen10 · compare
Buying a used SR850: what to check
Inspect CPU mezzanine board pins and UPI inter-socket bridge connections, ensure all 4 processor sockets have matched CPU steppings and identical heatsinks, verify RAID supercap condition, and check dual 1600W/2000W power supplies.
FAQ
How does the SR850 scale from 2 sockets to 4 sockets?
It utilizes an upper processor and memory mezzanine tray that connects directly over high-speed UPI links into the main system board.
How many memory slots are available when all 4 sockets are populated?
The full 4-socket configuration provides 48 DDR4 DIMM slots, accommodating up to 6TB of system memory.
What server replaced the ThinkSystem SR850?
The ThinkSystem SR850 V2 succeeded it, featuring 3rd Gen Intel Xeon Scalable (Cooper Lake) 4-socket processors.
Buying or selling SR850?
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 SR850 Server Product Guide, checked 2026-10-27