Lenovo ThinkSystem SD650 V2
The ThinkSystem SD650 V2 is Lenovo's flagship direct warm-water liquid-cooled dense compute server node, engineered with Lenovo Neptune Direct Water Cooling (DWC) technology for supercomputing, climate modeling, quantum chemistry, and national laboratory HPC clusters. Housed in the specialized 6U ThinkSystem DW612 Enclosure (which holds up to 12 dual-node SD650 V2 trays, totaling 24 server nodes and 48 processors), it extracts up to 90% of heat directly through copper water loops at inlet water temperatures up to 50°C, operating completely without internal fans. This delivers a Power Usage Effectiveness (PUE) below 1.05. Buyers of decommissioned nodes must inspect the dripless quick-disconnect hydraulic valves, verify water loop seals, and ensure liquid cooling rack infrastructure is available.
Also written as: ThinkSystem SD650 V2, SD650V2, Neptune Liquid Cooled, 7D1M
Specifications
| Brand | Lenovo |
|---|---|
| Family | ThinkSystem SD |
| Form factor | blade |
| Released | Apr 2021 |
| End of sale | Jun 2024 |
| Cpu sockets | 2 |
| Cpu platform | Dual 3rd Gen Intel Xeon Scalable processors (Ice Lake-SP) up to 270W TDP per node (with zero thermal throttling) |
| Memory slots | 16 |
| Memory type | DDR4-3200 RDIMM / 3DS RDIMM and Intel Optane Persistent Memory 200 Series |
| Memory max (GB) | 2,048 |
| Drive bays | Up to 2x 2.5-inch 7mm NVMe or SATA SSDs per node |
| Pcie slots | Up to 2 PCIe 4.0 x16 slots plus 1 OCP 3.0 slot per node |
| Network onboard | High-speed HDR/NDR InfiniBand or 100GbE mezzanine adapter plus dedicated management port |
| Power supply | Shared redundant power supplies in ThinkSystem DW612 enclosure (up to 9 power modules per rack manifold) |
Reference prices (last 14 days, updated 2026-10-27)
Refurbished: USD 4,900 (1 sighting, Oct 2026)
Used: USD 2,800 (1 sighting, Oct 2026)
All sightings
| Seller | Condition | Price | Note | Seen |
|---|---|---|---|---|
| ebay.com | used | USD 2,800 | Individual SD650 V2 tray with 2x Xeon Platinum 8358, 64GB DDR4, tested water loop | 2026-10-27 |
| serversupply.com | refurbished | USD 4,900 | Tray refurbished with dual 32-core Xeon processors, 128GB RAM, certified leak-free | 2026-10-27 |
Prices seen on public listings on the dates shown, before tax and shipping. Not an offer.
Compatible parts
Memory
- 4X77A83756 ThinkSystem 32GB TruDDR4 3200MHz (2Rx4 1.2V) RDIMM
Equivalent models from other brands
- HPE Cray Ex
Buying a used SD650 V2: what to check
Carefully inspect dripless quick-connect hydraulic fluid fittings for signs of corrosion or seal degradation, pressure-test internal copper cooling tubes for leaks, ensure processor cold plates remain flat without oxidation, and verify specialized manifold connectors.
FAQ
What cooling method is used by the SD650 V2?
It utilizes Lenovo Neptune direct warm-water liquid cooling, circulating warm water directly across CPUs, memory, and voltage regulators without internal chassis fans.
What is the operating water temperature for Neptune cooling on the SD650 V2?
It supports inlet water temperatures up to 50°C (122°F), eliminating the need for expensive mechanical chillers.
Can the SD650 V2 node operate in a standard air-cooled server rack?
No, it requires a dedicated water-cooled enclosure (DW612) and facility water distribution manifolds with dripless quick-disconnect hoses.
Buying or selling SD650 V2?
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 SD650 V2 Server Product Guide, checked 2026-10-27