Can this graphics card support a multi-monitor setup, and if so, how many monitors can it connect simultaneously?

Yes, this graphics card can support a multi-monitor setup and can connect up to 4 monitors simultaneously.

Questions & Answers: ASUS ProArt GeForce RTX 4070 SUPER OC Edition Graphics Card (PCIe 4.0, 12GB GDDR6X, DLSS 3, HDMI 2.1a, DisplayPort 1.4a) PROART-RTX4070S-O12G

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ASUS ProArt GeForce RTX 4070 SUPER OC Edition Graphics Card (PCIe 4.0, 12GB GDDR6X, DLSS 3, HDMI 2.1a, DisplayPort 1.4a) PROART-RTX4070S-O12G