As of March 2026, the most profitable coin for AMD Ryzen 9 3900X mining is Monero (XMR) on RandomX, with 12,589 H/s hashrate and $0.03/day net profit after electricity costs ($0.0727/kWh).
AMD Ryzen 9 3900X
Best coin: Monero — net $0.03/day
Specifications
System Build (used prices)
Mining Profitability
| Coin | Algo | Hashrate | CPU W | System W | Income/day | Elec/day | Profit/day | CPU H/s/W | Sys H/s/W | CPU $/W | Sys $/W | ROI CPU | ROI System |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Monero (XMR) | randomx | 12,589 H/s | 110 W | 171 W | $0.33 | $0.30 | $0.03 | 114.4 | 73.8 | $0.0030/W | $0.0019/W | 11.1 yr | 28.4 yr |
Frequently Asked Questions
What is the most profitable coin to mine with AMD Ryzen 9 3900X?
The most profitable coin for AMD Ryzen 9 3900X is Monero (XMR) on the RandomX algorithm. Net profit: +$0.03/day (gross income $0.33 minus electricity $0.30 at $0.0727/kWh). Actual profitability depends on your electricity rate, system downtime, and other overhead costs.
What is the hashrate of AMD Ryzen 9 3900X on RandomX?
The typical hashrate of AMD Ryzen 9 3900X on RandomX is 12,589 H/s at 110W CPU power draw. This is a realistic sustained 24/7 mining figure on a standard system without fine-tuning. Total system power from the wall is 171W (4.1 kWh/day).
How much does a AMD Ryzen 9 3900X mining system cost?
Minimum used build for AMD Ryzen 9 3900X: CPU — $136, motherboard (any AM4 B550/X570) — $99, RAM (DDR4 3200 8GB × 2) — $62, SSD — $19, PSU 550W — $31. Total: ~$347. Prices are approximate, based on the used market.
How long does it take for AMD Ryzen 9 3900X mining to pay for itself?
At current network parameters and $0.0727/kWh electricity: CPU-only payback — ~11.1 years, full system (~$347) payback — ~28.4 years. These estimates do not account for potential downtime, hardware wear, changes in network difficulty, or coin price fluctuations. Use the table above to enter your electricity rate for accurate numbers.