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Thank you for joining the Graphics Community. I can sure help with your question.
Based on the specification for your computer model, the DisplayPort™ 1.2 supports resolutions up to 4096 x 2304 @ 60Hz. You can check this specification here: HP EliteBook 820 G4 Notebook PC, HP EliteBook 840 G4 Notebook PC, HP EliteBook 850 G4 Notebook PC (QuickSpecs/c05240684.…