Technical data sheet · ThinkSystem V4 · 2U GPU inference, dual-socket

Lenovo ThinkSystem SR650i V4Specifications, configurations & comparisons

The ThinkSystem SR650i V4 is not a separate chassis but Lenovo’s fixed “Inference Model” build of the SR650a V4 GPU server: two NVIDIA RTX PRO 6000 Blackwell GPUs, two Xeon 6 6530P processors and 512 GB of memory, selected with one feature code. This data sheet sets out exactly what ships, what the order cannot change, and the chassis rules behind it.

2U Rack2 socketsXeon 6 P-coreXClarity Controller 3

192GBGPU memory2 × RTX PRO 6000 Blackwell, 96 GB each

600Wper GPUfull-power mode · front slots 21 and 23

64Xeon cores2 × Xeon 6 6530P, 32 cores each

512GBDDR5 fitted8 × 64 GB RDIMM · 6400 MHz

2NVMe drives fitted3.84 TB each · 8-bay backplane

3,200Wper power supply2 × Titanium CRPS Premium · 230 V

Configure an SR650i V4 →Get a UK quote

Every figure checked against the Lenovo ThinkSystem SR650a V4 and SR650i V4 Servers (August 27, 2026)

Image: Lenovo

Form factor: 2U Rack · 2 sockets
Processors: Xeon 6 P-core
Memory: 32 × DDR5 RDIMM · up to 512 GB as configured
Drive bays: Up to 8 · 1 backplane option
Expansion: 14 × PCIe · 2 × OCP 3.0
GPUs: Up to 2 · 1 listed
Boot: ThinkSystem M.2 RAID B550i-2i SATA/NVMe Enablement Kit
Management: XClarity Controller 3

01 — Overview

The SR650i V4 at a glance

Our read of Lenovo’s documentation: where the SR650i V4 is strong, and the limits worth knowing before you spec one.

Strengths

192 GB of GPU memory from a pair of RTX PRO 6000 Blackwell Server Edition cards from NVIDIA, each running in Lenovo’s full 600 W configuration.
One feature code (CF3G) pulls in the whole bill of materials, so the 600 W risers, 24K Ultra fans and 3200 W supplies arrive already matched to the GPUs.
The GPUs sit in front risers, leaving the rear PCIe 5.0 risers and both OCP 3.0 slots for networking and storage adapters.
It is ordered on the SR650a V4’s own machine types (7DGD three-year, 7DGC one-year), with the same XClarity Controller 3 management and Root of Trust security.
Lenovo documents a field change for the SR650a V4 chassis that moves the RTX PRO 6000 between two cards at 600 W and four at 450 W.

Watch-outs

Processors, GPUs, memory, drives and the network adapter are fixed in the order; any other mix means configuring an SR650a V4 instead.
Only eight DIMMs are fitted — four per processor against eight channels each — while Lenovo’s own guidance for best performance is to populate every channel.
Local storage is light: two 3.84 TB NVMe drives in an 8-bay backplane, and the chassis offers no 3.5-inch, mid-chassis or rear drive bays.
The 3200 W supplies are 230 V only with C20 inlets, and Lenovo specifies the build for a 25 °C data-centre environment.
At 924 mm deep the chassis is longer than the SR650 V4’s 796 mm, ships on Long Travel rails and has no front security bezel option.

Processors1 SKU

Cores / CPU32

DIMM slots32

Backplanes1

Max bays8

GPUsup to 2

PSU options1 · to 3,200 W

02 — Processors

1 supported processor, mapped

Both sockets hold the Xeon 6 6530P, a 32-core, 64-thread 6500-series P-core processor with a 2.3 GHz base and 4.1 GHz turbo, 144 MB of L3 cache and a 225 W TDP. It runs RDIMMs at up to 6400 MHz but does not support MRDIMMs, and each one contributes 88 PCIe lanes to a platform whose slots are all PCIe 5.0.

Processor landscape — cores × TDP

1 SKUs · 1 family

Xeon 6 P-core 1Bubble size = L3 cache · hover a bubble for the full SKU

Processor explorer

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Processor	Cores / threads	Base	L3 cache	TDP	W / core	Memory
Intel Xeon 6 6530P	32 / 64	2.3 GHz	144 MB	225 W	7.0	DDR5-6400

The two processors are joined by four UPI 2.0 links at 24 GT/s.
The 6530P carries two each of the QAT, DLB, DSA and IAA accelerator engines, plus Intel AMX, and supports a 128 GB SGX enclave.
The bill of materials specifies Lenovo’s 2U Standard heatsinks (BPDR) and presets the General Computing – Max Performance operating mode (C3J9).

03 — Memory

32 DIMM slots, 16 per processor

The chassis has 32 DIMM slots — 16 per processor, eight channels with two DIMMs each — but the Inference Model fixes memory at eight 64 GB TruDDR5 RDIMMs rated at 6400 MHz: 512 GB, four DIMMs per processor. The capacity chart shows what the slots could hold with every one filled.

Capacity with every slot filled

by DIMM size

Operating speed

per Lenovo memory tables

Processor	1 DIMM / channel	2 DIMMs / channel
Xeon 6 6530P · RDIMM	6400 MT/s	5200 MT/s

For the SR650a V4 chassis Lenovo requires identical DIMMs and the same count on each processor; its 64 GB 2Rx4 RDIMM is listed at 1, 4, 8, 12 or 16 per processor.
The SR650a V4 platform reaches 8 TB with 32 × 256 GB 3DS RDIMMs, which lies outside the fixed Inference Model.
The fitted modules are x4-based (2Rx4), so ECC, SDDC and ADDDC protection apply, and memory mirroring is available.

04 — Storage

1 backplane option, up to 8 bays

Storage is deliberately light: an 8-bay 2.5-inch Gen5 NVMe backplane holding two 3.84 TB read-intensive U.2 drives, and a mirrored pair of 960 GB M.2 boot drives on the internal B550i-2i. The other six front bays are left empty.

Headline layouts

front panel view

Front panel

The ThinkSystem 2U V4 8x2.5" NVMe backplane (C46P) with two 3.84 TB PCIe 5.0 NVMe drives installed; each bay has a dedicated x4 link to a processor, without oversubscription.

SAS/SATANVMeSAS/SATA + NVMe

Controllers & boot

Onboard NVMe (Non RAID NVMe, BC4V) - PCIe 5.0, optional RAID via Intel VROC — Software RAID. onboard; max 1; RAID levels per VROC licence
ThinkSystem M.2 RAID B550i-2i SATA/NVMe Enablement Kit — Boot. internal M.2, NVMe only (x1 lane/drive), integrated Broadcom RAID; max 1
ThinkSystem M.2 RAID B550i-2i SATA/NVMe Enablement Kit (internal, 2x M.2 NVMe, integrated Broadcom RAID) — boot

The B550i-2i accepts NVMe M.2 drives only, links each over one PCIe 4.0 lane, and defaults to RAID 1 with two drives; its M.2 drives are not hot-swap.
Onboard NVMe RAID uses Intel VROC under a separate licence, and no VROC licence appears in the Inference Model bill of materials.
Front hot-swap M.2 is offered only on SR650a V4 E3.S layouts, so it is not part of this 2.5-inch build.
The SR650a V4 chassis has no 3.5-inch, E3.S 2T (CXL), mid-chassis or rear drive bays.

05 — Accelerators & I/O

GPUs, PCIe and networking

The SR650a V4 platform mounts GPUs only in its front risers. In the 600 W configuration Lenovo allows two RTX PRO 6000 Blackwell Server Edition cards, in slots 21 and 23, each on a 600 W riser with the 600 W riser cage, air duct and 24K Ultra fans; capped at 450 W, the same card can run four to a server. 2 × RTX PRO 6000 Blackwell 96 GB at 600 W — fixed in this model.

NVIDIA RTX PRO 6000 Blackwell Server Edition 96GB PCIe Gen5 Passive (600W)

double-wide

96GB · up to 2

I/O topology

88 lanes per CPU

Each 6530P provides 88 PCIe lanes and eight memory channels, and every slot is PCIe 5.0. Front Riser 7 (slots 20–23) is wired to CPU 1 and Riser 6 (slots 16–19) to CPU 2; at the rear, Riser 2 (slots 3–5) belongs to CPU 1 and Riser 3 (slots 6–8) to CPU 2. Risers 1 and 4 are not used on this chassis.

Network adapters Lenovo lists

1 option

Adapter	Ports	Form
ThinkSystem Broadcom 57414 10/25GbE SFP28 2-port PCIe Ethernet Adapter	2 × 25GbE	PCIe

The Inference Model fits the x16 rear direct riser for slot 5, and its Broadcom 57414 25GbE card is a PCIe adapter rather than an OCP module.
A double-wide GPU in slot 21 or 23 makes the neighbouring slot, 20 or 22, unavailable.
OCP slot 1 can run at x16 only when slot 3 is not configured.
Slot 8 can be traded for a pair of rear hot-swap M.2 drives.

06 — Power & cooling

1 power supply, 3,200 W

The Inference Model ships with two 3200 W Titanium CRPS Premium supplies, the largest in the SR650a V4 list: 230 V only, C20 inlets, fitted as an identical redundant pair.

CRPS Premium adds zero-output (cold redundancy) standby, more accurate power metering, virtual reseat and a system cooling assist that can override fan speed.
Six 2U 6056 24K Ultra fan modules (CC8X) are fitted — the fan Lenovo requires for double-wide GPUs of 600 W or more.
For customers in China, every supply in the range also accepts 240 V DC.

07 — Management, security & OS

Run it, secure it, choose the OS

Management

XClarity Controller 3, OpenBMC on an ASPEED AST2600 with a dual-core Arm Cortex-A7
Optional XCC3 Premier licence for remote console, virtual media and System Guard
Dedicated 1GbE RJ-45 XCC port at the rear
Redfish, IPMI 2.0 and SNMP v3
XClarity Provisioning Manager, XClarity One and XClarity Energy Manager
Optional External Diagnostics Handset on the front diagnostics port

Security

TPM 2.0 Root of Trust with Platform Firmware Resiliency (NIST SP 800-193)
Secure Boot, factory-enabled or left for the customer to enable
Optional chassis intrusion switch · no front security bezel on this chassis
NationZ TPM 2.0 module for China
Intel TDX and Total Memory Encryption – Multi-Key
KMIP key management with IBM SKLM or Thales KeySecure for SEDs
CNSA Suite 1.0 cryptography for XCC; FIPS 140-3 validation listed as in progress

Operating systems

Microsoft Windows Server 2022 and 2025
Red Hat Enterprise Linux 9.4–9.8 and 10.0–10.2
SUSE Linux Enterprise Server 15 SP6, 15 SP7 and 16
Ubuntu 22.04, 24.04 and 26.04 LTS
VMware ESXi 8.0 U3, 9.0 and 9.1 — no factory preload with NVIDIA GPUs fitted

08 — Compare

How the SR650i V4 compares with its family

The SR650i V4 is one fixed build of the SR650a V4, which in open configuration takes up to four double-wide or eight single-wide front GPUs. The SR650 V4 is the 2U sibling that swaps front GPUs for up to 40 drive bays and GPUs in its rear slots, while the 8U SR680a V4 and the 3U AMD-based SR675 V3 are Lenovo’s larger GPU platforms. Bar values come from the individual spec files.

This modelSiblings and successorEach value from that model’s own verified spec file · bars scale per column

SR650a V4 data sheet SR650 V4 data sheet SR680a V4 data sheet SR675 V3 data sheet Dell PowerEdge R760xa data sheet

09 — Use cases

Three builds that suit the SR650i V4

Because the Inference Model fixes every major component, the three builds below share the same hardware and differ only in operating system and support term. Each opens in our configurator with the closest parts it offers for this model; we quote to Lenovo’s bill of materials.

LLM serving

Private LLM inference endpoint

Two 96 GB GPUs give 192 GB of GPU memory for serving language models on premises, with 512 GB of host memory and 25GbE networking alongside. Ubuntu 24.04 LTS is on Lenovo’s supported OS list for the platform.

2 × Xeon 6 6530P — 32 cores @ 2.3 GHz, 225 W each
2 × NVIDIA RTX PRO 6000 Blackwell Server Edition 96 GB, 600 W
8 × 64 GB TruDDR5 6400 RDIMM — 512 GB
2 × 3.84 TB NVMe on the 8-bay NVMe backplane
ThinkSystem M.2 RAID B550i-2i boot kit
Broadcom 57414 2 × 10/25GbE SFP28 PCIe
2 × 3200 W Titanium CRPS Premium (230 V)
Ubuntu Server 24.04 LTS

Our configurator’s M.2 list stops at 480 GB, while Lenovo fits two 960 GB NVMe M.2 drives in this model; we set the boot pair to Lenovo’s bill of materials when quoting.

Open this build in the configurator →

Enterprise inference

RHEL-standardised inference node

For estates that standardise on Red Hat, the fixed build runs RHEL 9 (Lenovo lists 9.4 to 9.8) or RHEL 10, paired here with five years of Premier support for a production inference service.

2 × Xeon 6 6530P — 32 cores @ 2.3 GHz, 225 W each
2 × NVIDIA RTX PRO 6000 Blackwell Server Edition 96 GB, 600 W
8 × 64 GB TruDDR5 6400 RDIMM — 512 GB
2 × 3.84 TB NVMe on the 8-bay NVMe backplane
ThinkSystem M.2 RAID B550i-2i boot kit
Broadcom 57414 2 × 10/25GbE SFP28 PCIe
2 × 3200 W Titanium CRPS Premium (230 V)
Red Hat Enterprise Linux 9

Lenovo fits U.2 PCIe 5.0 NVMe drives (feature C0ZU); the configurator’s nearest 3.84 TB NVMe entry stands in for them in this build.

Open this build in the configurator →

Vision & media AI

Video and image analytics server

Lenovo aims the SR650a V4 platform at text and media analysis among other workloads; the Inference Model applies that to multi-stream vision or media inference, here on Windows Server 2025 with Foundation support.

2 × Xeon 6 6530P — 32 cores @ 2.3 GHz, 225 W each
2 × NVIDIA RTX PRO 6000 Blackwell Server Edition 96 GB, 600 W
8 × 64 GB TruDDR5 6400 RDIMM — 512 GB
2 × 3.84 TB NVMe on the 8-bay NVMe backplane
ThinkSystem M.2 RAID B550i-2i boot kit
Broadcom 57414 2 × 10/25GbE SFP28 PCIe
2 × 3200 W Titanium CRPS Premium (230 V)
Windows Server 2025

Lenovo specifies this build for a 25 °C data-centre environment, and its 3200 W supplies need 230 V feeds.

Open this build in the configurator →

10 — Full specifications

Lenovo ThinkSystem SR650i V4 specifications

Configuration

Ordering	SR650a V4 CTO base (7DGDCTO2WW 3-year or 7DGCCTO2WW 1-year) plus feature CF3G
Chassis base	C3QN — SR650a V4 2.5"/EDSFF chassis
Operating mode	General Computing – Max Performance (C3J9)
Environment	Specified for a 25 °C data centre (BL0H)
Changes in the order	Processors, GPUs, memory, drives and network adapter are fixed

Chassis & cooling

Form factor	2U rack server
Dimensions (W × H × D)	445 × 87 × 924 mm · 482 mm across the EIA flanges
Weight	Maximum 38.8 kg
Fans	6 × 2U 6056 24K Ultra fan modules (CC8X)
Rails	Long Travel Toolless Slide Rail Kit V4

Processor

Processors	2 × Intel Xeon 6 6530P
Cores and clocks	32 cores / 64 threads each · 2.3 GHz base, 4.1 GHz turbo
Cache and TDP	144 MB L3 · 225 W each
UPI	4 × UPI 2.0 at 24 GT/s
PCIe lanes	88 per processor (slots are PCIe 5.0)
Heatsinks	2U Standard (BPDR)

Memory

Fitted	8 × 64 GB TruDDR5 6400 MHz 2Rx4 RDIMM (512 GB)
Slots	32 · 8 channels × 2 DIMMs per processor
Platform maximum	8 TB (32 × 256 GB 3DS RDIMM)

GPUs

Fitted	2 × NVIDIA RTX PRO 6000 Blackwell Server Edition 96 GB PCIe Gen5, passive
Power	600 W each (full-power configuration)
Slots	21 and 23 (front Riser 7) on 600 W front risers

Storage

Backplane	8 × 2.5-inch NVMe, PCIe Gen5 (C46P)
Drives	2 × 3.84 TB U.2 read-intensive NVMe PCIe 5.0
Boot	2 × 960 GB NVMe M.2 on the B550i-2i (RAID 1 by default)

Networking & I/O

Network adapter	Broadcom 57414 2 × 10/25GbE SFP28 PCIe
Rear riser	x16 direct riser, slot 5
OCP	2 × OCP 3.0 SFF slots, none populated in the bill of materials
Management	1GbE RJ-45 XCC3 port

Power

Supplies	2 × 3200 W Titanium CRPS Premium, 230 V, C20

Environment & warranty

ASHRAE	Class A2 in most configurations; A3, A4 or H1 depending on configuration
A2 operating range	10–35 °C
Maximum altitude	3,050 m
Warranty	3 years (7DGD) or 1 year (7DGC) · customer-replaceable units and onsite, 9 × 5 next business day

11 — FAQ

SR650i V4 questions, answered from the documentation

What is the Lenovo ThinkSystem SR650i V4?

It is Lenovo’s Inference Model: a fixed configuration of the SR650a V4 2U GPU server, ordered by adding feature code CF3G to an SR650a V4 CTO base. Lenovo selects the processors, GPUs, memory, drives and network adapter, and those cannot be changed in the order.

Which GPUs does the SR650i V4 have?

A pair of RTX PRO 6000 Blackwell Server Edition cards from NVIDIA (96 GB, PCIe Gen5, passively cooled), run in Lenovo’s full 600 W configuration in front slots 21 and 23. Together they provide 192 GB of GPU memory.

How much memory does the SR650i V4 have?

512 GB, as eight 64 GB TruDDR5 6400 MHz RDIMMs — four per processor. The chassis has 32 slots and supports up to 8 TB, but memory is one of the fixed components of the Inference Model order, and Lenovo’s guidance for best performance is to populate all eight channels per processor.

What processors are in the SR650i V4?

Two Intel Xeon 6 6530P processors, each with 32 cores and 64 threads, a 2.3 GHz base and 4.1 GHz turbo clock, 144 MB of L3 cache and a 225 W TDP — 64 cores in total.

What storage does the SR650i V4 include?

Two 3.84 TB read-intensive U.2 NVMe PCIe 5.0 drives in an 8-bay 2.5-inch NVMe backplane, plus two 960 GB NVMe M.2 boot drives on the B550i-2i RAID adapter. Six of the front bays are left empty.

How is the SR650i V4 different from the SR650a V4?

The SR650a V4 is the configurable platform: up to two 86-core processors, 8 TB of memory, eight single-wide or four double-wide front GPUs (two at 600 W), and eight 2.5-inch or E3.S bays. The SR650i V4 is one pre-set build of it, aimed at inference.

What power and cooling does the SR650i V4 need?

Two 3200 W Titanium CRPS Premium supplies on 230 V (C20 inlets) and six 24K Ultra fan modules, the fans Lenovo requires for 600 W GPUs. The build is specified for a 25 °C data-centre environment.

How big is the SR650i V4?

It measures 445 mm wide, 87 mm high and 924 mm deep, or 482 mm wide at the rack flanges, and weighs up to 38.8 kg. It ships with Lenovo’s Long Travel toolless slide rails.

Can the SR650i V4 run VMware ESXi?

ESXi 8.0 U3, 9.0 and 9.1 are on the SR650a V4 support list, but Lenovo will not factory-preload ESXi on a configuration with an NVIDIA GPU, so the hypervisor is installed after delivery.

Is the SR650i V4 end of life?

No end-of-service date appears in Lenovo’s product guide of 27 August 2026, which presents the Inference Model as a current SR650a V4 configuration. Cover depends on the warranty or service contract attached to each server, and dates Lenovo publishes later will show in our end-of-life checker.

Sources & verification

Where these figures come from

Lenovo ThinkSystem SR650a V4 and SR650i V4 Servers (August 27, 2026) — SR650i V4 Inference Model description and bill of materials (Table 5), standard specifications (Table 1), processor features (Table 7), memory (Table 11), backplanes and storage configs (Tables 14–15), slots (Tables 41–42), GPUs and 600 W rules (Tables 52–57), fans (Table 60), power (Table 61), dimensions (Table 81), operating environment, security and OS support.
Lenovo ThinkSystem SR650 V4 Server (September 8, 2026) — SR650 V4 chassis depth, used for comparison.

Specifications are extracted from Lenovo’s published documents and independently re-checked line by line. Configurations are quote-based; availability and exact options are confirmed at quotation. Last reviewed 2026-09-11.

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The SR650i V4 at a glance

Strengths

Watch-outs

1 supported processor, mapped

Processor landscape — cores × TDP

Processor explorer

32 DIMM slots, 16 per processor

Capacity with every slot filled

Operating speed

1 backplane option, up to 8 bays

Headline layouts

Controllers & boot

GPUs, PCIe and networking

NVIDIA RTX PRO 6000 Blackwell Server Edition 96GB PCIe Gen5 Passive (600W)

I/O topology

Network adapters Lenovo lists

1 power supply, 3,200 W

Run it, secure it, choose the OS

Management

Security

Operating systems

How the SR650i V4 compares with its family

Three builds that suit the SR650i V4

Private LLM inference endpoint

RHEL-standardised inference node

Video and image analytics server

Lenovo ThinkSystem SR650i V4 specifications

Configuration

Chassis & cooling

Processor

Memory

GPUs

Storage

Networking & I/O

Power

Environment & warranty

SR650i V4 questions, answered from the documentation

Where these figures come from

Buy & configure

Guides & family

Plan the deployment

Support & lifecycle

Get a quote for the Lenovo ThinkSystem SR650i V4

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