GPU path
Flexible, but not automatically profitable
- Can move among supported algorithms.
- Strong resale and general PC use.
- Requires careful PSU, riser, driver and airflow planning.
Free field guide · version 2.0 · reviewed 25 August 2026
GPU, CPU & Home ASIC Mining Starter Guide
A practical beginner manual for choosing mining hardware, planning power and cooling, commissioning safely, monitoring accepted work and maintaining a reliable home setup.
Educational information only. Profitability changes continuously. High sustained electrical loads should be assessed by a qualified electrician.
Decision path
Choose the algorithm before the hardware
Start with the coin, algorithm, pool and household constraints. A technically excellent miner can still be a poor home purchase after electricity, heat, noise, downtime and resale risk are included.
CPU path
Cache and memory matter
- Simple single-system entry.
- Useful fallback computer.
- More threads can reduce efficiency when cache or memory is saturated.
ASIC path
Purpose-built and locked in
- Highest hashrate for its fixed algorithm.
- Easy pool configuration once installed.
- Power, noise, heat and resale depend heavily on the exact model.
ASIC lock-in: a SHA-256 miner cannot switch to Scrypt or RandomX. Confirm the algorithm, coins and pool support before ordering.
Economics before parts
Convert every estimate into local net profit
Mining estimates move with coin price, network difficulty, block rewards, pool method, pool luck and uptime. Use conservative, base and optimistic cases, then replace source figures with measured payouts and wall energy.
Energy/day
wall watts × 24 ÷ 1000Electricity/day
kWh/day × USD per kWhNet/day
gross − power − fees − allowanceSimple payback
setup cost ÷ positive net/dayInclude the miner, motherboard, memory, storage, risers, PSU, cables, shipping, ventilation, circuit work, filters, pool/miner fees, repairs and downtime. Keep every input in USD when comparing with the site calculator.
Model daily, monthly and annual resultsGPU build checks
Buy for accepted work per wall watt
| Check | Why it matters |
|---|---|
| Supported architecture | The miner and driver must support the card generation and operating system. |
| VRAM capacity | The algorithm dataset or DAG must fit with operating headroom. |
| Hashrate per watt | A slower efficient card can net more than a faster high-power card. |
| Exact board model | Cooler, slot width, connectors, BIOS and limits vary by manufacturer. |
| Resale and warranty | A usable exit path lowers market and repair risk. |
Used GPU
Test at stock first
Confirm PCI identity and VRAM, inspect the edge and power socket, test every fan, then run memory and compute loads. Reject repeatable errors, abnormal fan noise, corrosion, burnt areas or rapid hotspot rise.
Multi-GPU rig
Count lanes and power branches
Read motherboard lane-sharing notes, confirm Above 4G Decoding, add one GPU at a time and use risers and connectors only within their manufacturer ratings.
Before ordering the rig
- Verify card dimensions, power plugs and recommended PSU.
- Allow intake clearance, exhaust space and cable bend radius.
- Price the complete rig, not only the cards.
- Use only the PSU family’s approved modular cables.
- Avoid unverified splitters or adapters and inspect connectors for heat or discolouration.
CPU build checks
Core count is only one part of CPU mining
CPU mining can be limited by cache, memory channels and NUMA layout rather than boost clock. XMRig’s RandomX guidance explains why automatic thread selection can outperform enabling every logical thread.
Platform
Match board, BIOS and memory
Check the motherboard support list, required BIOS, cooler clearance, VRM airflow and documented DIMM population order before buying.
Tuning
Verify huge pages and thread count
Enable huge pages using the operating-system method, confirm the miner reports success, then test thread counts while recording wall watts and pool-side work.
- Compare hashes per wall watt, not CPU package power alone.
- Populate memory channels correctly.
- Keep unnecessary background jobs from stealing cache and bandwidth.
- Watch CPU, motherboard VRM and memory temperatures during sustained all-core load.
- Confirm the system remains useful or resalable if mining stops.
Purpose-built miners
“Home ASIC” covers very different electrical classes
Low-power hobby units, compact 300–600 W miners and full-size machines drawing several kilowatts can all be advertised for home use. Judge the exact specification, circuit, room and neighbours—not the label.
| Example | Published operating point | Beginner reality |
|---|---|---|
| Bitaxe Gamma | About 1.2 TH/s target from one BM1370 chip; assembled power and cooling vary | Low-power SHA-256 learning or solo/pool mining. Verify the seller’s PSU, fan and warranty. |
| Goldshell Mini DOGE III Plus | 810 MH/s at 500 W; 620 MH/s at 300 W low-power; no more than 35 dB | Compact Scrypt miner, but still a continuous 300–500 W heat source. |
| Bitmain S21 Pro | 234 TH/s, 3510 W, 220–277 V AC, 20 A and 76 dBA | Industrial-style SHA-256 miner needing electrical, ventilation and noise planning. |
ASIC pre-purchase checks
- Algorithm, pool and expected payout method.
- Nominal hashrate, wall watts and efficiency such as J/TH or J/MH.
- Exact voltage, input current, PSU and power-cord model.
- Ethernet or Wi-Fi setup requirements.
- Operating temperature, humidity, noise and warranty conditions.
- Official firmware source, return process and ventilation cost.
Power delivery
Design for continuous load and the exact connector
A PSU wattage label is not a complete power plan. Add GPU/CPU limits, board, fans, storage, startup behaviour and headroom. Measure at the wall with a meter rated for the load.
Electrical safety: do not choose a cord by connector appearance, mix modular PSU cables, assume a splitter increases a connector’s rating, overload extension leads or improvise fixed wiring. Have a qualified electrician confirm voltage, circuit capacity, protection and receptacles for sustained high-power equipment.
Bitmain specifies the S21 Pro for 220–277 V AC, single-phase 20 A input and an adapted 4000 W maximum condition. Bitmain also publishes model-specific PSU and cord tables; air-, water- and oil-cooled models can use different parts.
Residential reality
Remove heat from the room and measure noise where it matters
Nearly every watt drawn becomes heat. Fans move heat through a miner but cannot remove it from a closed room. Separate cool intake from hot exhaust and prevent recirculation.
| Miner load | Energy/day | Approximate heat |
|---|---|---|
| 40 W | 0.96 kWh | 136 BTU/h |
| 500 W | 12 kWh | 1,706 BTU/h |
| 1,000 W | 24 kWh | 3,412 BTU/h |
| 3,510 W | 84.24 kWh | 11,976 BTU/h |
- Reduce load first.A stable low-power mode or power limit cuts energy and heat together.
- Separate intake and exhaust.Stop hot air returning to the miner.
- Move room heat out.Size extraction for the real load and account for duct restriction.
- Inspect filters.Dust control adds resistance and needs maintenance.
- Avoid unsafe acoustic boxes.Do not trade noise for overheating or blocked emergency access.
Goldshell specifies the Mini DOGE III Plus at no more than 35 dB, while Bitmain specifies the S21 Pro at 76 dBA at 25°C. NIOSH treats repeated workplace exposure at 85 dBA or higher as hazardous; measure normal operation where people are exposed and consider neighbours and night-time use.
First start
Commission at stock settings before tuning
- Inspect and record.Photograph serials, connectors and shipping condition; check fans and heatsinks.
- Build in stages.Add one GPU, riser or power branch at a time.
- Use documented power.Confirm voltage, PSU and cord before powering an ASIC.
- Configure the pool.Verify algorithm, endpoint, worker and payout address.
- Run an attended thermal soak.Record wall watts, local/pool hashrate, temperatures, fan RPM and accepted/rejected work.
- Test recovery.Verify safe shutdown, restart and recovery after network or power interruption.
Operate with evidence
Optimise accepted work per wall watt
| Monitor | What it can reveal |
|---|---|
| Pool-side hashrate | Accepted work; short windows can vary with share luck. |
| Rejected, stale and invalid shares | Excess clock, pool mismatch, network delay or hardware errors. |
| Wall watts | Actual operating cost and whether a power change worked. |
| Core, hotspot, memory or chip temperature | Thermal limit, recirculation, dust or degraded contact. |
| Fan RPM and errors | Blocked airflow, failing fan or sensor problem. |
| Uptime and restarts | Watchdog loop, unstable tune, thermal shutdown or power interruption. |
Change one variable, wait for thermal and pool data to settle, then compare with the stock baseline. A higher local hashrate is not an improvement if accepted work falls or wall watts rise faster.
Keep it reliable
Use a simple maintenance cadence
| Cadence | Actions |
|---|---|
| Daily | Check pool-side hashrate, accepted/rejected work, temperature, fans, restarts and payout trend. |
| Weekly | Listen for new fan or airflow noise; check room heat, intake/exhaust obstruction, logs and disk space. |
| Monthly | Power down when cleaning is needed; inspect dust, filters, fins, fans, connectors, cable strain and discolouration. |
| Quarterly | Re-measure wall power, test restart/recovery, review official firmware notes and compare profitability assumptions. |
| Seasonally | Re-test maximum inlet temperature and adjust power or ventilation before hot weather. |
Bitmain recommends shutting ANTMINER units down before cleaning and gives a monthly dust-cleaning recommendation. Goldshell advises a clean environment, stable voltage, fan and abnormal-noise checks, and no plugging or unplugging while powered. Follow the exact model manual and warranty conditions.
Find the first failed layer
Return to stock and isolate one component
| Symptom | Check in this order |
|---|---|
| No power | Outlet/circuit → approved cord → PSU → connectors → component isolation. |
| GPU missing | Power → slot/riser → cable → Above 4G → lane sharing → driver/OS. |
| CPU hashrate low | Huge pages → thread count → cache/memory → NUMA → throttling → background jobs. |
| ASIC hashboard missing | Logs → temperatures/fans → cables → stock firmware/clocks → manufacturer support. |
| Rejected or invalid shares | Pool/algorithm → wallet/worker → clocks/voltage → errors → network. |
| Hashrate falls after warm-up | Inlet temperature → recirculation → dust/filter → fans → throttling → power. |
| Revenue below estimate | Accepted work → downtime → difficulty/price → fees → wall energy → assumptions. |
Protect earnings and equipment
Separate the pool, miner and wallet risk zones
- Download miners and firmware only from official sources.
- Verify pool hostname, port, TLS option, algorithm, fee and payout method.
- Change default miner credentials and place miners on a controlled network.
- Use unique passwords and multi-factor authentication for pools, exchanges and dashboards.
- Keep wallet seeds, private keys and API secrets off mining rigs and screenshots.
- Back up configurations and recovery information offline.
- Sanitise IPs, serials, wallet addresses and tokens before sharing logs.
A receiving address can be shared when needed; a recovery seed cannot. Support staff should never need the seed.
Primary references
Sources and update policy
Manufacturer and project documentation was checked on 25 August 2026. Specifications, firmware and profitability change; re-check the live source for the exact model before buying or servicing equipment.
- BITMAIN S21 Pro specification
- BITMAIN power supply and power cord models
- BITMAIN ANTMINER cleaning guidance
- Goldshell Mini DOGE III Plus specifications and care
- Bitaxe Gamma open-source hardware project
- XMRig huge pages
- XMRig RandomX optimisation guide
- lolMiner official releases and options
- Hiveon OS overclocking profiles
- CDC/NIOSH noise exposure guidance
- Trezor wallet backup safety
- Hashrate.no mining profitability estimates
Next step
Price the full setup before buying hardware.
Use the calculator with measured or manufacturer wall power, then compare the conservative result with your maximum acceptable payback.