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TSUKUMO

株式会社ヤマダデンキ

Gunma / Takasaki

A Japan-based PC manufacturing and assembly partner that combines Akihabara-born PC parts expertise with domestic assembly and inspection, supporting high-quality BTO PCs from one unit depending on the project. TSUKUMO should be treated not as an independent OEM company, but as a store brand of Yamada Denki Co., Ltd. Public information does not clearly confirm third-party brand OEM/ODM contract manufacturing, but eX.computer's domestic assembly, inspection, shipment, full model customization, operation testing, and track record with corporate, education, and research users make it a strong candidate for high-performance PC projects where stable operation and optimized configuration matter, including gaming, creator, CAD/CG, R&D, and workstation use. Rather than a mass-production OEM, it is best positioned as a small-lot, purpose-specific domestic BTO partner focused on expert specification support and quality checks.

Supported items

Electronics/Other

Past clients

東京大学、京都大学、大阪大学、北海道大学、国土交通省、NHK、理化学研究所、JAXA、産業技術総合研究所

Strengths

Akihabara-born PC parts expertiseDomestic assembly and inspectionBTO consultation from one unitCustomization across modelsHigh-performance PCs and workstationsOperation checks and stress testingEducation, research, and public-sector track recordCorporate and public-fund purchase support

Production terms and quality

Supported products

  • BTO PCs, desktop PCs, gaming PCs, and creator PCs
  • High-performance PCs and workstations for CAD/CG, R&D, simulation, and video production
  • Purpose-specific PC configuration proposals for companies, schools, and research institutions, plus server and workstation assembly consultation

Lot guidance

Business BTO models are confirmed as available from one unit. Large deployments, multiple units with the same configuration, third-party brand OEM/ODM availability, and monthly production capacity are not publicly confirmed and should be checked per project.

Sample terms

A formal sample program is not publicly confirmed. If purchasing one evaluation unit, timing will likely follow standard BTO lead times, so confirm evaluation-unit pricing, loaner availability, return conditions, and configuration-change terms at the first discussion.

Quality and certifications

eX.computer products are confirmed as assembled, inspected, and shipped from a domestic factory, with operation testing across models and quality inspection emphasized for business users. Confirmed PC stability-related checks include memory testing, hardware recognition checks, post OS/driver installation checks, comprehensive stress testing, and optional 12-hour load testing. However, ISO 9001 status for the TSUKUMO BTO factory, full versus sampling inspection details, third-party inspection availability, and the applicable scope of ISO 14001 / ISO 27001 should be confirmed during inquiry.

Best for

  • Labs, educational institutions, public-sector buyers, and corporate IT teams that need stable domestic BTO PCs configured around use case, budget, and performance requirements
  • Projects where GPU, CPU, memory, and cooling optimization directly affects results, including gaming, streaming, video production, 3D CG, CAD, and simulation
  • Buyers who prioritize domestic assembly, domestic inspection, one-unit validation, and smoother corporate or public-fund purchasing over overseas mass-production OEM routes

Checks before inquiry

  • Public information does not clearly state third-party brand OEM/ODM contract manufacturing. Always confirm logo changes, chassis customization, BIOS settings, custom packaging, warranty name, and contracting entity.
  • Factory address, monthly capacity, line count, equipment model numbers, and standard production lead time are not public. For multi-unit deployments or rush projects, confirm inventory, configuration, inspection scope, and shipping schedule in advance.
  • The fit is strong for BTO PC bodies and assembly, but public evidence is insufficient for contract manufacturing of peripherals such as keyboards, mice, headphones, or speakers, so confirm scope by product.

Service scope

Planning and design proposal

Supported

Sample development and testing

Needs confirmation

Material and packaging sourcing

Supported

Mass production and processing

Supported

Quality, certification, and labeling

Needs confirmation

Packing, kitting, and logistics

Supported

Manufacturing equipment

domestic pc assemblydomestic pc inspectiondomestic shippingbto customization systemakihabara planning designpc parts procurementhardware checkmemory testos driver installationhardware recognition checkstress testingload testing 12hpre shipment inspectionserver workstation assemblypc initial setup