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CompTIA A+ Core 1 (220-1201)HardwareHard

A client is building a new gaming PC. They want to connect a high-refresh-rate 4K monitor. Which video interface is BEST suited to support both 4K resolution and refresh rates of 120Hz or higher?

  1. ADVI-D Dual Link
  2. BHDMI 2.1
  3. CDisplayPort 1.2
  4. DVGA
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Correct answer: B. HDMI 2.1

For 4K resolution at 120Hz or higher, significant bandwidth is required. HDMI 2.1 and DisplayPort 1.4 or newer are the primary interfaces that can handle this. HDMI 2.1 natively supports 4K@120Hz and even 8K@60Hz without compression due to its 48 Gbit/s bandwidth. DisplayPort 1.4 can achieve 4K@120Hz with Display Stream Compression (DSC). DisplayPort 2.0/2.1 offers even higher capabilities. Given the options, HDMI 2.1 is an excellent choice for a high-refresh-rate 4K monitor.

Why the other options are wrong

  • A. DVI-D Dual Link can support 1440p at 144Hz or 4K at 30Hz, but not 4K at 120Hz or higher.
  • C. DisplayPort 1.2 supports 4K at 60Hz. While DisplayPort 1.4 (not an option) supports 4K 120Hz with DSC, DP 1.2 does not meet the requirement.
  • D. VGA is an analog interface with very limited bandwidth, incapable of supporting 4K resolution at any refresh rate.

High-Bandwidth Video Interfaces

Digital video connectors capable of transmitting high-resolution and high-refresh-rate signals, essential for modern displays.

  • HDMI 2.1 and DisplayPort 1.4+ are current leading standards.
  • Bandwidth determines maximum resolution and refresh rate support.
  • Features like VRR and HDR also rely on sufficient bandwidth.

Memory trick: High Demands Need Dedicated Digital Data.

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