What You Actually Need to Know Before Running Miner Cat 4
Miner Cat 4 is a GPU mining program that supports multiple algorithms, mostly aimed at Ethereum Classic, Ergo, and a handful of other AltLayer coins. It is not a magic solution that will make you rich. It is a tool. Like any tool, it works if you know how to use it, and it will cause headaches if you ignore its quirks. I have been running miners for years, and Miner Cat 4 sits somewhere in the middle of the pack for ease of use. The interface is cleaner than some alternatives but the configuration files still require actual attention. I set mine up on a 6-card rig with RTX 3080s and got reasonable hashrates, but the first time I ran it I also managed to overheat one card by about twelve degrees because I did not set the power limit correctly. That is the kind of thing that happens when you just download something and hit run.
Getting Miner Cat 4 Installed
The download link is on the official Minercat website. Do not grab it from a random forum post or a mirror site. There have been multiple copies floating around with miners added to the binary, and you do not need that. Grab it from the source, check the SHA256 hash if you care about that sort of thing, and unzip it somewhere reasonable. Inside the folder you will find a few things: the main executable, a configuration example file, and a readme. Open the config file in a plain text editor. Not Word. A plain text editor. The fields you need to change are your pool URL, your worker name, your wallet address, and the algorithm. For most people running ETC on nicehash or a similar pool, the config looks something like this: STRATUM_SERVER = stratum+tcp://etc.elpool.xyz:3333
WALLET_ADDRESS = your_wallet_here
WORKER_NAME = rig1
ALGORITHM = etchash
Save that file, rename it if the readme says to, and run the executable. I usually name my config files with a timestamp so I can track which version was running when. Keeps things organized when you are testing different pools or algorithms over weeks.
Get the Full Details
Performance Notes and Things That Actually Matter
The default power settings in Miner Cat 4 are conservative. That means your hashrate will be lower than what you see on benchmark sites. I usually reduce the power limit on my 3080s to around 240 watts and tweak the memory clock in the config. For ETC mining on those cards, moving the memory clock up by 150 MHz and the core down by 50 MHz typically gives you about 8 to 12 percent more hashrate with no stability issues. YMMV depending on your specific card silicon and cooling setup. One thing that catches people off guard is the stratum timeout setting. By default, Miner Cat 4 will disconnect from the pool after about 60 seconds of no job received. If you are on a slow or congested network, or using a pool that broadcasts jobs less frequently, your rig will spend a lot of time reconnection cycling. I changed the timeout to 180 seconds in the config and stopped seeing those gaps entirely. It is a small change but it made a noticeable difference in my effective hashrate over a 24-hour period. Another thing nobody mentions in the quick-start guides: Miner Cat 4 does not handle mixed GPU architectures well. I tried running it with a mix of 3080s and a couple older 1080 Ti cards and the hashrate dropped below what the 1080 Ti cards could achieve individually on their own software. The mining scheduler inside Miner Cat 4 seems to balance work across all detected cards rather than optimizing per-card performance. Remove the weaker cards from that rig and the remaining ones performed better overall. It is not intuitive but it is consistent.
Common Pitfalls I Have Seen
The most common mistake I see people make is running Miner Cat 4 without monitoring temperatures. The software itself does not have a robust built-in temperature reporting system. You need to pair it with something like GPU-Z or HWiNFO64 running in the background. I keep HWiNFO64 open on a second monitor and watch the hot spot temperatures. If any card hits 85 degrees C on the hot spot, I shut the miner down and check my cooling. It has saved me twice from thermal throttling that would have slowly degraded card performance over days. A second issue is the Windows Defender false positive. Miner Cat 4 gets flagged by Defender on fresh installs because the behavior patterns match common mining malware. I have whitelisted the folder on every machine I run it on. You can also temporarily disable real-time protection, run the miner, and re-enable it, but whitelisting the folder is cleaner. Expect to deal with this on the first run. And here is a blunt truth about Miner Cat 4: it is not the most efficient miner for every coin. For ETC it is solid. For Ergo it is decent but not top tier. If you are primarily mining Ergo, you might be better off with GMiner or TeamRedMiner depending on your AMD cards. Miner Cat 4 is a good all-rounder, not a specialist. Knowing that will save you hours of benchmarking and disappointment.
If you decide to go with it, keep the config simple, monitor your temps, and do not expect it to fix a rig that has poor airflow or a weak power supply. Mining hardware is only as good as the infrastructure behind it. I have seen people try to run six high-end cards on a 750-watt PSU and wonder why the system crashes under load. The miner is not the problem there. The PSU is. There. That covers the basics and the stuff the documentation does not really address. Good luck with it.
