Vnish Firmware
Stock Bitmain firmware leaves real efficiency on the table. Vnish unlocks per-chip voltage control, autotuning, and power limits that stock can't touch — same hash, less watts.
What Vnish unlocks
The upgrades that matter if you're actually running the hardware
Per-chip voltage control
Vnish tunes voltage at the individual chip level, not the board. Chips that run hot or inefficient get dialed back. The rest run harder. Net result: better TH/W than stock gets you.
Built-in autotune
Run the autotune cycle once on your hardware and Vnish profiles each chip's optimal operating point. Set it, walk away, come back to a fully dialed machine.
Flexible power limits
Cap power consumption to fit your electrical situation — useful for 110V circuits with tighter amperage budgets or tiered electricity pricing. Stock firmware has no equivalent.
Detailed diagnostics
Per-board and per-chip hash rates, temperatures, and fault codes. When a board starts degrading you'll see exactly which chips are struggling — not just a generic fault.
Eco & performance modes
Switch between efficiency-first (Eco) and hashrate-first (Turbo) profiles without reflashing. Useful when power pricing changes or you want to push during low-rate hours.
Custom thermal limits
Set your own chip and board temp thresholds. Critical if you're running in a warmer environment — you decide where the machine throttles, not Bitmain's conservative defaults.
Supported hardware
Vnish supports the full S19 lineup — the same hardware ReHashRigs specializes in.
Full and updated model support list on the Vnish/Anthill Farm site. Highlighted models are ReHashRigs inventory focus.
Stock vs Vnish
What you're giving up by leaving stock firmware on a machine you paid for.
| Feature | Stock Bitmain | Vnish |
|---|---|---|
| Per-chip voltage tuning | ✗ None | ✓ Full control |
| Power limit / cap | ✗ Not available | ✓ Watt-level precision |
| Autotune | ✗ Not available | ✓ Built-in |
| Per-chip diagnostics | ⚠ Board-level only | ✓ Chip-level detail |
| Eco / Turbo modes | ✗ Not available | ✓ Switchable profiles |
| Custom thermal limits | ⚠ Fixed defaults | ✓ Fully configurable |
| Immersion cooling support | ✗ Not available | ✓ Fan-off mode |
| Hashrate reporting accuracy | ⚠ Pooled estimates | ✓ Local real-time data |
| Efficiency (J/TH) at same hashrate | ⚠ Baseline | ✓ Typically 3–8% improvement |
Flash it yourself
If you already have hardware and want to flash Vnish yourself — it's straightforward. The Anthill Farm installer handles the heavy lifting.
Download via partner link
Grab the correct firmware build for your exact model from the link below. Match the board type — S19 and S19 Pro use different builds.
Flash via Bitmain web UI
Log into your miner's IP, go to System → Upgrade, upload the Vnish .tar.gz file. The miner reboots into Vnish automatically.
Run autotune
First boot, run the autotune cycle. Takes 20–30 minutes per board. Let it finish before setting pool targets — it profiles each chip individually.
Set your power profile
Configure your watt cap and thermal limits for your environment. 110V machines: stay under ~1,900W total draw to hold a 20A circuit comfortably.
Don't want to flash it yourself?
All ReHashRigs units marked Vnish FW ship with Vnish already installed, autotuned to that specific hardware, and ready to point at your pool. No setup beyond adding your worker credentials.