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Yes, the Dell S2725QC 27" 4K UHD monitor can work with an older MacBook (2015) running macOS 12.7.6, but there are a few important points:. The monitor supports USB‑C with DisplayPort Alt Mode and HDMI. A 2015 MacBook (depending on model): MacBook Pro (2015) → has Thunderbolt 2 / Mini DisplayPort. MacBook (12-inch, 2015) → has USB‑C, but only USB 3.1 Gen 1, not DisplayPort Alt Mode. macOS 12.7.6 (Monterey) supports external displays, but the connection depends on the port type.
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