Give the pilot one device and one question
Use the exact model on the device. This page is for Antminer S21. Our current S21 catalogue lists an AML build; confirm your own board and use the catalogue for the current file choice
Write down your local device identifier, installed build and profile. Then choose one question: does this profile reduce measured power, increase useful output, or improve the calculated result at your tariff? Change one thing at a time so you can follow the answer
Confirm the control boardSave A before you create B
A is your baseline from this device. Before changing it, capture the profile, measurement window, hashrate source and measured power
Keep TH/s and W tied to the same operating interval. Label hashrate as a device or pool reading and as instantaneous or averaged
Measure power at the same point with the same instrument in both runs. If A uses a dashboard estimate and B a wall measurement, they need that difference resolved. If the meter includes other equipment, record the boundary
Measure B without losing the context
Record B's build or profile and observation window. Keep the hashrate source, power boundary and surrounding conditions comparable to A. Note material changes in cooling, intake conditions, pool or other settings
Mark startup, adjustment periods and restarts separately. Record the window you actually used; repeat it if unstable readings or changed conditions prevent a useful conclusion. Errors and gaps belong beside the performance figures
Decide whether the pair is ready to compare
Before calculating money, read the two records together. Same S21? Comparable windows? TH/s and W from the same run? Clear source and fee basis?
A missing answer gives you a specific next action: measure again or resolve that gap. A complete pair gives you an observation on this device, under the recorded conditions. Use it to plan the next step
| Check | Ready to compare | If it differs |
|---|---|---|
| Device | The same S21 | Separate records from different devices |
| Window and source | TH/s and W describe the same run and comparable windows | Repeat the missing measurement |
| Power | The same instrument and measurement point | Use a common boundary |
| Events | Errors and restarts are recorded | Resolve the unknown before deciding |
Keep the two records together
Fill the worksheet while the readings are in front of you. It creates a short text record to copy for your notes or a question to us. Your entries stay on this page. Copy the record to keep it
Keep a pool figure that already excludes the developer share labelled as a pool observation. The calculator needs hashrate on a basis before the fee it will apply
Now take your pair to the calculator
Enter your recorded TH/s and W in A and B, each profile's applicable fee and a shared gross revenue basis before that fee. Add your electricity tariff and start with one miner
The calculator assumes 24 operating hours per day and constant inputs. Assess different downtime or extra costs separately
Use the comparison to choose the next action: further observation, another comparable run or a specific support question. The current S21 catalogue leads to your firmware choice and the existing installation route