Matching CFM When Mixing S19 Revisions in One Row
Cartridge specs differ between S19 batches—mixed rows need careful airflow pairing to avoid false 'bad unit' readings.
Hosting rows often accumulate mixed hardware purchases. Each Antminer S19 revision uses slightly different shroud geometry and fan curves. All units may exceed 0.05 TH/s, yet thermal baselines are not interchangeable.
Label by shroud sticker, not purchase date
Revision codes on the shroud plate determine cartridge SKU. Logging units by sticker prevents pulling a compatible-but-wrong CFM module from stock during a rushed swap.
Avoid tuning by neighbor PWM alone
If one unit runs fans louder, confirm CFM class before assuming failure. A mismatched replacement can make a healthy unit look sick by comparison.
Standardize per shelf segment
Where possible, group identical shroud revisions on the same shelf segment. Mixed rows work, but monitoring thresholds should be segment-specific.
Audit before bulk orders
A thermal audit across the row identifies which SKUs you actually need. Bulk ordering one cartridge type for convenience often leaves mismatched spares unused.