ZDKG Compute Center for Diagnostics & AI Compute
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Engineering Lab · Germany · EU B2B Supply

Recertified Datacenter GPUs & AI Nodes — Engineered to Production Spec.

ZDKG Compute is an engineering-led specialist in the diagnostics, refurbishment, and recertification of enterprise AI servers and datacenter GPUs. Combining board-level repair, BMC firmware recovery, and HBM thermal restoration with automated stress telemetry, we supply universities, research laboratories, and European enterprises with warranty-backed compute well below OEM list prices.

Request Hardware Quote Inspect Test Protocol
0 Uncorrectable ECC Full-address HBM2e / HBM3 sweep gate
Full-TDP Burn-In 1 Hz continuous thermal & power telemetry
EU VAT & Warranty Compliant invoicing & 12-month B2B coverage
Academic & Enterprise Formal quotes for universities, labs & R&D

Root-Cause Hardware Engineering

Why Enterprise AI Hardware Is Retired Early — And How We Restore It

Datacenter GPUs and multi-GPU compute nodes frequently leave primary service due to reversible firmware, thermal-interface, or board-level faults rather than silicon degradation. Instead of reselling untested "working pulls," we diagnose and engineer every subsystem back to factory tolerances.

SUBSYSTEM 01 HBM2e / HBM3 THERMALS

HBM Thermal Interface Restoration

Under multi-year datacenter cycling, factory thermal pads on High-Bandwidth Memory stacks dry out, compress unevenly, or suffer TIM pump-out. Resulting memory hotspot spikes (>95 °C) trigger severe clock throttling, fan runaways, or transient bit errors on healthy silicon.

ZDKG Engineering Protocol ESD-safe disassembly, ultrasonic flux/silicone oil removal, calibrated Shore-00 HBM pad replacement & phase-change die interface, verified via before/after ΔT load curves.
SUBSYSTEM 02 BMC / IPMI / VBIOS

BMC Firmware & Lockout Recovery

Complete compute nodes and accelerators are routinely flagged as defective due to corrupted BMC flash images, hyperscaler custom-firmware lockouts, mismatched baseboard/HGX firmware versions, or interrupted driver/vGPU provisioning states.

ZDKG Engineering Protocol Out-of-band SPI flash verification, clean OEM BMC/Redfish & VBIOS re-provisioning, cryptographic signature validation, and full PCIe/NVLink enumeration checks across Linux HPC stacks.
SUBSYSTEM 03 VRM & POWER RAILS

Power-Rail & Board-Level Remediation

Tripped eFuses, latched protection circuits, degraded 12VHPWR / 48V busbars, or imbalanced DrMOS power stages prevent node power-on or cause drops under transient Tensor Core spikes—despite intact GPU dies and memory stacks.

ZDKG Engineering Protocol Board-level impedance mapping, oscilloscope Vcore/VDDQ ripple measurement under dynamic step loads, VRM phase & high-current connector restoration.
SUBSYSTEM 04 AUTOMATED VALIDATION

Automated Memory & Stress Certification

Booting to an idle OS desktop or checking nvidia-smi misses intermittent HBM bank faults, single-lane PCIe CRC errors, and high-TDP thermal saturation defects that crash multi-day distributed training runs.

ZDKG Engineering Protocol Automated full-address VRAM/HBM pattern testing, DCGM Level-4 diagnostics, sustained FP64/BF16/FP8 compute burn-in, and 1 Hz telemetry archival tied to each serial number.

Validation Architecture

The 5-Stage ZDKG Recertification Pipeline

Every accelerator and server node passes five mandatory engineering gates in our German test laboratory before earning certification for institutional deployment.

STAGE 01

Optical & Electrical Intake

Microscopic PCB, BGA, and connector inspection alongside cold-rail resistance and short-circuit profiling prior to first power-up.

GATE: Rail Z within OEM spec
STAGE 02

Hardware & Firmware Rebuild

Board-level power remediation, precision HBM/die thermal interface rebuild, and clean OEM VBIOS, BMC, and CPLD firmware baseline flashing.

GATE: Clean SHA-256 FW & TIM
STAGE 03

HBM & Interconnect Sweep

Automated full-capacity HBM2e/HBM3 bit-error sweeps, ECC register audit, and PCIe Gen4/Gen5 & NVLink bandwidth/CRC margin verification.

GATE: 0 DBE · 0 Page Retire
STAGE 04

Full-TDP Burn-In & Telemetry

Sustained 100% TDP Tensor Core & LLM workload stress testing with continuous 1 Hz logging of core/HBM junction temperatures, clocks, and power draw.

GATE: Thermal steady-state OK
STAGE 05

Serialized Dossier & EU Dispatch

Issuance of UUID-bound test certificate, ESD-shielded shock packaging, compliant EU VAT invoicing, and 12-month commercial B2B warranty.

GATE: Certified EU Release

Hardware Scope

Supported Accelerators & Compute Nodes

We source, refurbish, and certify high-memory datacenter GPUs and turnkey multi-GPU servers configured for LLM training, high-throughput inference, molecular simulation, and scientific HPC.

Datacenter PCIe GPUs

Drop-in dual-slot & single-slot passive accelerators validated for standard enterprise rack servers.

  • NVIDIA H100 PCIe / NVL (80GB / 94GB HBM3)
  • NVIDIA A100 PCIe (80GB / 40GB HBM2e)
  • NVIDIA L40S / A40 (48GB GDDR6 ECC)
  • NVIDIA RTX 6000 Ada / L4 Inference Cards

Multi-GPU SXM & HGX Nodes

Complete 4-GPU and 8-GPU compute nodes certified as integrated thermal, power, and fabric systems.

  • 8x / 4x A100 & H100 SXM Baseboard Systems
  • Supermicro, Dell PowerEdge XE, Gigabyte, ASUS
  • AMD Instinct MI210 / MI250 / MI300 Nodes
  • Redundant Titanium PSUs & Clean BMC/IPMI

Cluster Interconnect & Host Memory

Validated host subsystems ensuring zero bottlenecks between CPU, RAM, storage, and GPU fabric.

  • Dual EPYC / Xeon Scalable Host Validation
  • DDR4 / DDR5 ECC RDIMM Memtest Qualification
  • ConnectX-6 / ConnectX-7 InfiniBand & RoCEv2
  • Enterprise NVMe U.2 / U.3 Scratch Arrays
Procurement Criterion Secondary Broker ("Untested / Pull") ZDKG Certified Hardware New OEM List Channel
Capital Cost (CapEx) Low upfront, high failure risk 35–60% below OEM list price 100% OEM list price
HBM Thermal Interface Aged factory pads, frequent throttling Restored TIM + verified ΔT curve Factory new
BMC & VBIOS State Often locked, stale, or mismatched Clean OEM baseline, SHA-verified Factory baseline
Proof of Silicon Health Screenshot or none ("as-is") Serialized 72h telemetry + 0 DBE report Standard factory QA
Invoicing & Warranty Often non-EU, no commercial RMA EU VAT invoice + 12M B2B warranty (DE) OEM contract (multi-week lead time)

Institutional & Commercial Compliance

Structured for Universities, Research Labs & EU Enterprises

Public research chairs and corporate IT departments cannot buy unverified hardware from auction platforms. We bridge the gap between secondary hardware economics and strict European procurement compliance.

Academic & Public Procurement

Formal itemised PDF quotations suitable for university procurement offices and grant budgets (DFG, BMBF, Horizon Europe). Support for institutional purchase orders and German/EU e-invoicing standards (XRechnung / ZUGFeRD).

Compliant EU VAT Invoicing

Proper commercial invoices issued from Germany (§ 14 UStG) with stated German VAT or intra-community EU B2B Reverse-Charge handling—eliminating customs friction, import duties, and accounting blockers within the European Union.

12-Month B2B Warranty & Direct RMA

Every certified GPU and compute node is backed by a 12-month commercial B2B warranty handled directly by our engineering lab in Bad Schönborn, Germany—supported by archived baseline telemetry for rapid root-cause resolution.

Hardware Acquisition & Decommissioning

Liquidating Decommissioned, Untested, or Fault-Flagged GPU Lots?

We purchase server GPUs and multi-GPU compute nodes directly from European datacenters, insolvency administrators, leasing providers, and hardware brokers—including untested batches, BMC-locked nodes, and fault-code units. Fast engineering evaluation and reliable B2B settlement.

Offer Hardware Lot

Direct Engineering Desk

Request Availability, Formal Quote, or Diagnostic Consultation

Speak directly with hardware engineers—no sales call centers. Configure your inquiry below to open a structured RFQ in your mail client or copy it directly.

Structured Inquiry Builder

Zero tracking or third-party form processors: generates a clean engineering specification for direct email dispatch.

Direct Contact & Lab Coordinates

All commercial shipments, EU VAT invoicing, and hardware diagnostics are operated out of Baden-Württemberg, Germany.

Engineering & Procurement Email
info@zdkg.de
Operator & Address
ZDKG Compute · Lucas Schmutz
Heidelberger Str. 15
76669 Bad Schönborn · Germany
Customer Scope
B2B Only — Universities, Research Institutes, Public Authorities & Commercial Enterprises across the EU.
Security & Responsible Disclosure
security@zdkg.de (Policy)