Testimonials
The longevity report on a batch of used S19j Pros saved us from a bad deal. Three of the ten units the broker listed as "lightly used" were already down 15% on hashrate. We used the report to negotiate ₩18 million off the asking price.— Hyun-woo R., mining operator, Busan
I run a 45-unit farm outside Daegu. The fleet lifecycle assessment told me exactly which S17s to retire this quarter and when the M50S purchase would actually break even against repair costs. The report was dense — took me two evenings to read fully — but every section had a number I could act on.— Young-sook M., facility owner, Daegu
Good evaluation overall. The on-site power audit found two units with failing fans that were drawing 30% more power than the rest. My only reservation is that scheduling took three weeks because their bench was fully booked — plan ahead if you have a purchase deadline.— Thomas B., independent miner, Seoul
We commissioned a longevity evaluation before importing 15 Whatsminer M30S units from a supplier in Shenzhen. The bench test caught a voltage instability issue that would have voided warranty coverage. Worth the fee ten times over.— Ji-eun H., import coordinator, Incheon
Case Study: Warehouse Lot in Gyeonggi
A client approached us in early 2025 with an offer to purchase 32 Antminer S19 units from a warehouse liquidation in Gyeonggi Province. The asking price was ₩38 million — roughly 35% below current market for units of that age.
We sampled six units across the lot for a 72-hour burn-in at our Daegu bench. Findings:
- Average hashrate measured at 82 TH/s against a factory rating of 95 TH/s
- Four of six sampled units showed hashboard thermal variance above our replacement threshold
- Fan replacement cost for the full lot estimated at ₩4.2 million within six months
- PSU failure rate in this batch series: 18% within 12 months per our reference data
We recommended renegotiating to ₩29 million or walking away. The client renegotiated to ₩31 million, budgeted ₩5 million for immediate fan and PSU replacements, and projected break-even at month 14 instead of the month 9 the seller had implied.
The client reported at month 11 that actual performance matched our projections within 8%.