No it does not, it has a headphone jack instead for audio output

Can you Play on 10 bit?

you can play on 8 bit, 10 bit and 12 bit

How loud is the monitor fan? Can you adjust the fan curve from the service menu or something?

No way to get into the service menu, I contacted Asus directly and they refuse to tell me how to get in. I can't really hear the fan though.

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ASUS PG27AQN 27" WQHD 1440P IPS 360Hz ROG Swift HDR 1ms, G-SYNC, NVIDIA Reflex Latency Analyzer, Height Adjustable, DisplayPort, USB Gaming Monitor

The world's first QHD 360Hz gaming monitor designed for professional esports gamers
Adopt world's first ultra Fast IPS technology
High dynamic range (HDR) technology with DisplayHDR 600 compliance
120~125% sRGB and DCI-P3 95% color space gamut for a wider range of lifelike image
NVIDIA Reflex Latency Analyzer gives competitive gamers an accurate measurement of system latency
Esport Dual-Format mode: you can play at the familiar 25” diagonal size at 1080p. Simply enable Dual-Format in the monitor settings and choose your desired resolution.
Robust Connectivity with USB 3.2 x2, DisplayPort 1.4 DSC and HDMI (v2.0) x3 ports
What’s in the box: USB 3.2 cable, DisplayPort cable, HDMI cable, Power cord & adapter, ROG sticker, Color pre-calibration report, Quick start guide, Warranty Card, Welcome Card
Free 3-month Adobe Creative Cloud Subscription: Receive complimentary access with the purchase of this product (offer valid from 9/15/2021 to 8/31/2024)