Client Reports & Testimonials

Feedback and case notes from mining operators who used Filehemlockcore benchmark reports for purchase and deployment decisions.

What Clients Say

We brought three used S19 units to Daegu before signing a warehouse lease. Two matched their advertised efficiency; the third was drawing 400 watts over spec. That one report saved us roughly six months of margin on a 48-rig deployment.
— Hyeon-jun Park, small-scale farm operator, Gyeonggi Province
The write-up was thorough and the lab conditions were documented clearly. I would have liked a faster turnaround during peak season, but the numbers themselves were solid enough to renegotiate our hosting contract.
— Mei Lin, hosting facility manager, Busan
I used the pre-purchase screening on a lot of six M50 units from a liquidation auction. Four passed, two failed on fan noise and elevated draw. Saved me from wiring up dead weight in a space I already pay rent on.
— Dong-hyun Seo, equipment reseller, Incheon
Report was detailed. The thermal images helped us reposition intake fans in our container setup. Only gripe: the CSV column headers could be clearer for someone not used to reading power analyzer exports.
— Sarah Okonkwo, container farm operator, Ulsan

Case Note: Gyeonggi Hosting Bay Audit

A 120-rig hosting facility in Paju contacted us in March 2025 after their KEPCO bill jumped 18% quarter-over-quarter despite stable occupancy. We conducted an on-site power assessment over two days.

Findings:

  • Aggregate draw at the main panel exceeded sum-of-nameplate by 11%
  • Four racks had reversed hot/cold aisle containment, raising inlet temps to 32°C
  • Spot-checks on six representative units showed J/TH figures 6–14% worse than manufacturer specs

Outcome: The facility reconfigured aisle containment and replaced 14 failing fans. Follow-up spot-checks three months later showed aggregate draw within 3% of recalculated expectations. The client used our report in a successful rate renegotiation with their colocation landlord.

Case Note: Comparative Analysis for Fleet Upgrade

An operator in Daejeon weighing S19 XP vs. S21 units sent four machines (two of each) for comparative rig analysis. Our parallel runs at 25°C ambient showed the S21 units averaging 19.8 J/TH vs. the S19 XP at 21.4 J/TH, with the S21 drawing 180 fewer watts per unit at equivalent hashrate.

The operator used the ranked table — with cost projections at their 95 KRW/kWh industrial rate — to justify a phased upgrade over six months rather than a single bulk purchase.

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