HP #970 Black Ink Cart CN621AA

Page yield — All listed HP OfficeJet Pro X‑series printers support cartridges with an estimated 3,000‑page yield, suitable for medium‑to‑high‑volume office printing.

Compatible models — Applies to the X476dw, X451dw, X576dw, and X551dw, which share similar PageWide ink technology.

Print efficiency — These models use HP PageWide technology, offering fast print speeds and lower cost‑per‑page compared to traditional inkjets.

Use case — Ideal for small to mid‑sized offices needing reliable color output with reduced operating costs.