Solo Mining Ethereum Classic 2026: Etchash GPU Setup Guide

Ethereum Classic remains one of the more approachable GPU-mined coins for solo miners. Not because the difficulty is low — it definitely isn’t — but because the Etchash algorithm still runs efficiently on consumer hardware, and the network hashrate hasn’t reached the astronomical levels of some other chains.

I’ve been running ETC solo mining tests since late 2026, mostly to understand the variance patterns on GPU-based coins. Here’s what the math and real-world testing have taught me about solo mining Ethereum Classic in 2026.

Why Solo Mine Ethereum Classic in 2026

Let me break this down: Ethereum Classic uses the Etchash algorithm, which is essentially Ethash with the DAG size limitation removed. This means older GPUs that couldn’t mine ETH toward the end can still mine ETC — though the DAG continues growing.

Current ETC price: price unavailable

The block reward sits at 2.56 ETC per block (after multiple halvings), with a block time of roughly 13 seconds. Network difficulty in early 2026 hovers around 2.5 PH/s, which sounds massive but translates to more reasonable solo mining odds than you’d get with Bitcoin or even Litecoin.

Important detail: ETC doesn’t have the hash power that ETH PoW forks briefly enjoyed. The network is stable, the difficulty adjusts predictably, and the coin has maintained trading volume on major exchanges. That stability matters for solo mining because you need to know the block you eventually find will actually have market value.

Realistic Block Find Probability

Let’s do the math. With a single RTX 4090 running about 130 MH/s on Etchash at current difficulty, you’re looking at roughly one block every 7-8 months statistically. That’s much better odds than Bitcoin solo mining, but still requires patience.

Stack three RTX 4090s and you’re at 390 MH/s — roughly one block every 10-11 weeks. Six cards brings you to 780 MH/s and one block roughly every 5-6 weeks.

These are statistical averages. You might find two blocks in one month, then nothing for six months. That’s variance. If you can’t handle that psychologically or financially, pool mining makes more sense. No judgment — variance is genuinely hard to live with.

Etchash GPU Recommendations for Solo Mining ETC

I tested this for two months before writing about it. Not every GPU makes sense for solo mining Ethereum Classic in 2026, especially when you factor in electricity costs and the need for sustained operation.

High-End Current Generation

Mid-Range Options

Previous Generation Cards

The RTX 3090 still pulls about 120 MH/s and the RX 6900 XT around 65-70 MH/s. If you already own these, they’re fine for solo mining ETC. Buying them used in 2026 mostly depends on local electricity prices and card condition.

Cards with less than 8GB VRAM won’t work anymore — the ETC DAG exceeded that threshold back in 2026. This eliminates most RTX 3060 and similar cards from consideration.

Setting Up Your Ethereum Classic Solo Mining Node

This is where solo mining gets real. You can’t just point your GPUs at a pool and call it solo mining — that’s still pool mining with PPLNS payout. True solo mining requires running your own full node.

Core-Geth Installation

Core-Geth is the most widely used Ethereum Classic client. Download it from the official GitHub repository — always verify signatures before running blockchain software.

Installation steps vary by operating system. On Linux (which I recommend for dedicated mining rigs):

• Extract the Core-Geth archive to a directory like /opt/core-geth/
• Create a data directory for the blockchain, ideally on an SSD with at least 200GB free space
• Initialize the node with the mainnet configuration
• Start the sync process — expect 6-12 hours for full sync depending on your internet connection

The command to start Core-Geth for solo mining looks roughly like this:

./geth –classic –http –http.addr 0.0.0.0 –http.port 8545 –http.api eth,web3,net –allow-insecure-unlock –mine –miner.etherbase YOUR_ETC_ADDRESS

Replace YOUR_ETC_ADDRESS with an ETC wallet address you control. This is where your block rewards will go if you find a block. Seriously, triple-check this address. Consider using cold storage for block rewards — finding a block then losing it to a compromised wallet is genuinely painful.

Node Sync and Maintenance

The full Ethereum Classic blockchain sits around 120GB in early 2026. The sync process validates every block from genesis, which takes time. Fast sync modes exist but aren’t recommended for solo mining — you want the full validated chain.

Once synced, your node needs stable internet and continuous uptime. Every minute offline is a minute you’re not competing for blocks. I run my node on a separate machine from my mining GPUs to isolate issues.

Monitor your node logs regularly. Watch for:

• Peer connections — you should maintain 10-30 peers consistently
• Block sync status — “imported new chain segment” messages every 10-15 seconds
• Any error messages about database corruption or network issues
• Disk space — the chain grows continuously

Configuring Mining Software for Etchash Solo Mining

Your GPUs need software that talks to your Core-Geth node. Several miners support Etchash and solo mining configurations.

T-Rex Miner Configuration

T-Rex handles NVIDIA cards well and supports direct node connections. A basic solo mining config file looks like:

{
“algo”: “etchash”,
“url”: “http://127.0.0.1:8545”,
“user”: “YOUR_ETC_ADDRESS”,
“worker”: “worker1”,
“intensity”: 22
}

The URL points to your local Core-Geth node. The user field contains your ETC address. Worker name helps identify which rig found a block if you’re running multiple setups.

Intensity affects hashrate and stability. Start at 22 and adjust up or down based on your GPU’s behavior. Higher isn’t always better — crashed miners earn zero hashrate.

lolMiner for AMD Cards

lolMiner handles AMD GPUs effectively. The command line approach:

lolMiner –algo ETCHASH –pool http://127.0.0.1:8545 –user YOUR_ETC_ADDRESS –worker rig1

Similar structure to T-Rex but with different syntax. Both miners support configuration files and command line options — pick whichever matches your workflow.

GMiner also works for solo mining if you prefer that software. The key element is pointing to your local node at 127.0.0.1:8545 instead of a pool address.

Testing Your Setup

Before considering your setup complete, verify everything works:

• Check that GPUs show hashrate in the mining software
• Confirm Core-Geth logs show “new mining work” messages when blocks arrive
• Verify GPU temperatures stay under 75°C for sustained operation
• Watch power consumption — does it match expectations?
• Monitor rejected shares — should be near zero with local node

Let the system run for 24 hours before calling it stable. Watch for crashes, thermal throttling, or connection issues.

Solo Mining ETC Economics in 2026

Here’s where the honest math comes in. Mining profitability depends entirely on your electricity cost, and solo mining adds variance on top of that.

Electricity Cost Reality Check

A six-GPU rig with RTX 4090s pulls roughly 2.1-2.3 kW from the wall (GPUs plus system). At $0.10/kWh, that’s $5.04 per day in electricity. At $0.15/kWh, you’re at $7.56 per day. At $0.20/kWh, that’s over $10 daily.

With 780 MH/s, you’ll statistically find one block every 5-6 weeks. That’s 2.56 ETC per block. At current ETC prices around $30-35, that’s roughly $80-90 per block before electricity.

Important detail: If you’re paying more than $0.12/kWh, the economics get challenging. A six-week period at $0.15/kWh costs you $317 in electricity for that single block worth approximately $85. That’s deeply unprofitable unless ETC price increases significantly or difficulty drops.

Finding ways to reduce electricity costs matters more than GPU optimization in most cases.

Profitability Scenarios

Let me break down three scenarios with a 780 MH/s rig (six RTX 4090s):

Cheap electricity ($0.08/kWh):
Daily cost: $4.03
Block every ~40 days statistically: 2.56 ETC = ~$85
40-day electricity cost: $161
Loss per cycle: -$76

Moderate electricity ($0.12/kWh):
Daily cost: $6.05
Block every ~40 days: $85
40-day electricity cost: $242
Loss per cycle: -$157

Expensive electricity ($0.18/kWh):
Daily cost: $9.07
Block every ~40 days: $85
40-day electricity cost: $363
Loss per cycle: -$278

These numbers assume current difficulty and ETC prices. Neither stays constant. The math doesn’t favor solo mining ETC purely for profit in 2026 unless you have extremely cheap or free electricity.

Why Solo Mine ETC Then?

Honestly? Most people solo mining Ethereum Classic in 2026 are doing it for reasons beyond immediate profit:

• Testing mining strategies and software configurations
• Learning blockchain technology hands-on
• Gambling on ETC price appreciation (if you mine at $30 but it reaches $100, the math changes)
• Already have the hardware paid off and cheap electricity
• Enjoying the lottery aspect — variance adds excitement for some miners

There’s no shame in pool mining ETC instead. You’ll earn predictable payouts and avoid the psychological burden of variance. Compare your expected returns against Bitcoin or Kaspa solo mining before committing significant resources.

Optimizing Your Etchash Mining Performance

Assuming you’ve decided to proceed with solo mining Ethereum Classic despite the economics, optimization helps squeeze out every MH/s from your hardware.

GPU Overclocking for Etchash

Etchash is memory-intensive. Your GPU’s memory clock matters more than core clock for hashrate. I spent two weeks testing various configurations on my test rig.

For NVIDIA RTX 40-series cards:

• Core clock: -200 to -100 MHz (underclocking saves power without hurting hashrate much)
• Memory clock: +1200 to +1500 MHz (test stability — some cards don’t handle +1500)
• Power limit: 70-80% (Etchash doesn’t need full power to achieve good hashrate)
• Fan speed: Manual control to keep temps under 70°C

For AMD RX 7000-series:

• Core clock: Moderate undervolt (950-1000mV)
• Memory clock: 2600-2700 MHz fast timing mode
• Power limit: Adjust based on individual card behavior
• Memory timing tweaks: Some AMD cards benefit from tighter timings

Use MSI Afterburner for NVIDIA cards or MorePowerTool plus OverdriveNTool for AMD cards. Test stability for 24 hours after any change — crashes during the month-long variance period hurt your odds.

System-Level Optimization

Mining rigs need stable operating conditions:

• Use wired ethernet — WiFi adds latency and connection drops
• Disable Windows updates on mining rigs (or use Linux and avoid the problem)
• Configure motherboard BIOS for above 4G decoding if running multiple GPUs
• Use separate PCIe power cables for each GPU — don’t daisy chain connectors
• Monitor ambient room temperature — hot rooms lead to thermal throttling

Keep the Core-Geth node on an SSD. The constant database reads and writes wear out hard drives quickly, and slow disk access causes stale shares.

Personal Experience: My First ETC Solo Block

I ran a three-GPU test rig (mix of RTX 4070 Ti cards) for four months starting August 2026. Total hashrate around 260 MH/s, which statistically should find one block every 3.5-4 months.

For the first two months, absolutely nothing. I checked the miner logs daily even though I knew it was irrational — probability doesn’t care about checking. Month three, still nothing. I started doubting my node configuration even though I’d verified it multiple times.

Block arrived on day 118. Just appeared in the Core-Geth logs: “Successfully sealed new block.” No fanfare, no notification, just a log entry. The 2.56 ETC showed up in my wallet about 30 minutes later after sufficient confirmations.

What did I learn? Variance is genuinely harder to handle than the technical setup. The mathematics say 3.5-4 months average, but that’s an average across infinite attempts. Any single attempt can land anywhere in the probability distribution.

The electricity cost for those 118 days at $0.11/kWh came to about $184. The block was worth approximately $89 at the ETC price when I found it. I lost about $95 on the experiment, but learned significantly about variance tolerance and node management.

Would I do it again? Probably not for profit. But the experience taught me more about solo mining dynamics than any article could.

Common Pitfalls and How to Avoid Them

After testing and talking with other ETC solo miners, certain mistakes appear repeatedly.

Wrong Wallet Address Configuration

This sounds obvious until you mistype one character and direct your block reward to someone else’s address — or worse, an invalid address that burns the coins. Verify your configured address three times. Send a small test transaction to confirm you control it.

Node Not Fully Synced

Starting to mine before your Core-Geth node finishes syncing wastes hashrate. The node needs the complete blockchain to validate new blocks. Check sync status with the “eth.syncing” command in the Geth console. It should return “false” when fully synced.

Ignoring Rejected Shares

Solo mining should show near-zero rejected shares since you’re mining directly to your local node. High reject rates indicate connection issues, stale work, or misconfiguration. Fix this before assuming your setup works correctly.

Insufficient Node Hardware

Running Core-Geth on the same machine as your mining GPUs works for small setups, but six or more GPUs benefit from a dedicated node machine. The blockchain database operations compete with mining for system resources.

Minimum node specs: 4-core CPU, 8GB RAM, 250GB SSD, stable internet. That naturally depends on your total mining hashrate and how many rigs connect to the node.

Not Monitoring for Forks

Ethereum Classic has experienced several 51% attacks historically. While less common now, chain reorganizations happen. Your node might briefly be on the wrong chain, wasting hashrate. Monitor network status through ETC community channels and node logs.

Alternative: Mining ETC to a Pool vs Solo Mining

I need to be honest here: for most GPU miners in 2026, pool mining Ethereum Classic makes more financial sense than solo mining it.

With pool mining:

• Daily or weekly payouts remove variance
• No need to run and maintain your own full node
• Pool handles blockchain monitoring and fork protection
• You can calculate exact expected earnings
• Simpler technical setup overall

The tradeoff is pool fees (typically 0.5-1%) and no chance at full block rewards. Some pools offer “solo mining” options where you get the full block if your share finds it, but you’re still technically pool mining.

Popular ETC mining pools in 2026 include 2miners, Ethermine, and F2Pool. All offer stable connections and reasonable fee structures.

Solo mining ETC makes sense if:

• You have significant hashrate (multiple TH/s brings variance to manageable levels)
• You can handle months without income
• Electricity costs are minimal (under $0.08/kWh)
• You’re learning and the experience has value beyond profit

Otherwise, pool mining delivers better risk-adjusted returns. That’s not a defeat — it’s matching strategy to circumstances.

Future-Proofing Your ETC Solo Mining Setup

Ethereum Classic’s future involves slowly declining block rewards through its monetary policy. The next reduction occurs around 2026, dropping rewards further.

DAG Size Growth

The Etchash DAG continues growing. In early 2026 it sits around 5.5GB, but it’ll exceed 6GB later in the year. Plan GPU purchases with future DAG growth in mind — an 8GB card will eventually become unusable for ETC.

Cards with 12GB or more VRAM have several more years of viability. The RTX 4090’s 24GB means it’ll mine ETC until either the card dies or mining becomes completely unprofitable.

Network Hashrate Trends

ETC network hashrate has remained relatively stable around 180-250 TH/s since 2026. No massive increases like we saw in 2026, but also not declining significantly. This stability helps with planning — difficulty spikes hurt solo mining odds considerably.

Monitor hashrate trends through sites like 2miners.com or BitInfoCharts. A sudden 50% difficulty increase halves your block find probability.

Hardware Failure Planning

GPUs running 24/7 eventually fail. Budget for replacement fans, thermal paste reapplication, and potential card replacement. A six-GPU rig typically needs maintenance every 6-12 months to keep everything running optimally.

Keep spare components: extra PCIe risers, at least one backup PSU, thermal pads, and quality thermal paste. A failed $15 riser shouldn’t cause days of downtime on a multi-thousand-dollar rig.

Frequently Asked Questions

Is solo mining Ethereum Classic profitable in 2026?

Not at current prices and difficulty for most miners. At typical electricity costs ($0.10-0.15/kWh), you’ll spend more on power than you’ll earn in block rewards statistically. Solo mining ETC makes sense only with very cheap electricity (under $0.08/kWh) or if you value the experience and learning process beyond immediate profit. Pool mining delivers better economics for almost everyone.

How much hashrate do I need to solo mine ETC successfully?

There’s no minimum, but practical considerations matter. With 100 MH/s, you’ll find approximately one block per year statistically. With 500 MH/s, roughly one block every 2-3 months. With 1 TH/s, you’re looking at one block every 30-40 days. Higher hashrate doesn’t just mean more blocks — it reduces variance to more manageable levels psychologically. Anything under 300 MH/s requires serious patience.

Can I solo mine ETC on a single GPU?

Technically yes, but expect extreme variance. A single RTX 4090 at 130 MH/s will statistically find one block every 7-8 months. But that’s an average — you could easily go 14 months with nothing, then find two blocks in one week. The mathematics work the same regardless of hashrate, but the psychological burden of variance increases significantly with lower hashrate. Consider dual mining another coin simultaneously to at least earn something during dry periods.

Do I need to run a full Ethereum Classic node for solo mining?

Yes. True solo mining requires your own full node. Pointing mining software at a pool’s “solo” option is still pool mining — the pool controls block finding and validation. Running your own Core-Geth node means you validate blocks independently and claim the full reward if you find one. The node requires roughly 120GB storage and a stable internet connection, but otherwise runs on modest hardware.

What happens if I find an ETC block while solo mining?

Your mining software will submit the valid block solution to your Core-Geth node, which broadcasts it to the network. Other nodes validate and accept it (usually within seconds), and the 2.56 ETC block reward plus transaction fees go to your configured wallet address. Rewards become spendable after 100 confirmation blocks, which takes about 20-25 minutes on Ethereum Classic. The feeling is genuinely satisfying after months of waiting, though the economics might still show a loss depending on your electricity costs during that period.