APW12 4000w

APW12 1215a, 1215b, and 1215c power supply units are suitable for Antminer E9, D7, S19+, S19A pro, S19A, S19j pro, S19j, S19i, S19, S19 Pro, and T19.
APW12 1215a, 1215b, and 1215c versions are interchangeable with each other (no voltage feedback).
APW12 1215d, 1215e, and 1215f versions are interchangeable with each other (with voltage feedback).
APW12 1215d, 1215e, and 1215f versions can be upgraded with firmware to replace a/b/c versions, but a/b/c versions cannot be used to replace d/e/f versions.