HDMI vs DisplayPort vs USB-C: Which Cable Should You Actually Use?

For most office monitors, use whichever cable the monitor and laptop both support natively: HDMI or DisplayPort for a desktop PC, and a single USB-C cable for a laptop whose USB-C port carries video. Pick DisplayPort when you want high refresh rates or to daisy-chain monitors, HDMI for TVs and meeting-room screens, and buy a cable rated for the resolution and refresh rate you actually run, not the biggest number on the box.

Below, each common office setup is matched to the right cable, with store examples from ATEN: the ATEN 2L-7D02H21 Ultra High Speed HDMI Cable, the ATEN High Speed True 4K HDMI Cable, the ATEN DisplayPort 1.4 Cable, the ATEN UC3238 USB-C to 4K HDMI Converter, the ATEN VC986B DisplayPort to HDMI Active Adapter and the ATEN VE811 HDBaseT Extender.

Which cable for which job? The quick answer

Prices are as listed on 23 Oct 2026. All six ATEN items were in stock at the time of writing, each with a 2-year local carry-in warranty stated on the listing.

HDMI vs DisplayPort vs USB-C: what is the actual difference?

HDMI is on almost every TV, projector and meeting-room display, and most monitors. DisplayPort is the PC monitor standard on graphics cards, workstations, docks and KVM switches, and supports Multi-Stream Transport (MST) for several monitors on one link. USB-C is a connector, not a video standard. VESA describes DisplayPort over USB-C as "DisplayPort Alt Mode", which allows "video and data transmission as well as charging from the same cable". If a laptop's USB-C port does not support Alt Mode (or Thunderbolt), no cable will make it output video. Your Laptop Has USB-C. So Why Doesn't Everything Work? shows how to check.

At 1080p or 1440p and 60 Hz, all three carry the picture equally well. The differences matter at higher resolutions and refresh rates, over distance, or when you mix connectors.

Which HDMI cable do I need? Reading the labels

HDMI Licensing Administrator (HDMI LA) certifies cables by name, not version number ("HDMI 2.1 cable" is shorthand). Its cable guide lists:

• High Speed HDMI Cable: up to 10.2Gbps, for 1080p, and 4K at 30 Hz.
• Premium High Speed HDMI Cable: certified for 4K/UltraHD at up to 18Gbps, with HDR support. This is the 4K60 office cable.
• Ultra High Speed HDMI Cable: introduced with the HDMI 2.1 Specification, for systems up to 48Gbps and 8K@60 and 4K@120.
• Ultra96 HDMI Cable: up to 96Gbps, for all HDMI 2.2 features, including uncompressed 8K@60 and 4K@240 at 4:4:4.

HDMI LA says every certified cable must carry its official name on the jacket, and the Ultra96 and Ultra High Speed labels carry a QR code you can scan to verify certification. Be wary of a bag that only says "8K" without the certified name.

In practice: a 4K monitor at 60 Hz needs no more than a cable rated for 4K60, such as the ATEN High Speed True 4K HDMI Cable, which ATEN rates for 4096 x 2160 and 3840 x 2160 at 60 Hz with 4:4:4 colour and HDCP 2.2. Step up to the ATEN 2L-7D02H21 Ultra High Speed HDMI Cable (S$27.00, 1.8 m, 48 Gbps) only when the source and display both run 4K at 120 Hz, 8K, VRR or eARC. HDMI LA states that HDMI 2.2 is backward compatible with earlier versions, so a newer cable will not stop an older screen working.

Is DisplayPort better for monitors?

For PC monitors, often yes. It locks firmly and supports MST. The ATEN DisplayPort 1.4 cables are rated for HBR3 at 32.4 Gbps and up to 8K at 60 Hz. VESA notes DisplayPort 1.4a reaches 8K at 60 Hz using 2:1 compression.

DisplayPort 2.1 raises the ceiling. VESA's January 2025 announcement gives UHBR20, the top tier, "a maximum throughput of 80 Gbps", carried on VESA-certified DP80 cables, and adds DP80LL active cables up to three metres. That matters for very high resolution or refresh-rate displays on a UHBR-capable GPU; office monitors at 1440p or 4K60 run fine on DisplayPort 1.2 or 1.4. If you are deciding between 4K and 1440p in the first place, read Your 4K Monitor Might Be Making Work Harder first.

Daisy-chaining is DisplayPort's party trick: a PC that supports MST can drive a second monitor through the first monitor's DisplayPort output. The PC, the first monitor (it needs a DP out port) and the cable all have to support it. One Monitor or Two? covers multi-monitor layouts, and Your New Docking Station Doesn't Work? covers MST and Mac display limits through a dock.

Does a USB-C to HDMI cable work with any laptop?

No. It works only if the laptop's USB-C port outputs video, through DisplayPort Alt Mode or Thunderbolt. The ATEN UC3238 (S$77.00) is a single 2.7 m cable from USB-C to HDMI, rated for 3840 x 2160 at 60 Hz with HDCP 2.2, and ATEN states that "data-only USB-C ports will not output video". No driver or power is needed, so it suits a meeting-room table for BYOD (bring your own device) presentations.

Check the laptop, too. Apple's MacBook Air guide says the MacBook Air supports one external display, and the M3 model up to two only with the lid closed. To charge through the same connection you need a dock or hub with Power Delivery; see Why Your Laptop Charger Isn't Charging Your Laptop.

Adapters: why direction matters

Most video adapters are one-way. A DisplayPort to HDMI adapter takes a DisplayPort source (a PC or graphics card) and feeds an HDMI display. It will not let an HDMI-only laptop drive a DisplayPort-only monitor. Read the title as source first, display second.

The rating matters as much as the direction. ATEN sells two DisplayPort to HDMI adapters that look alike: the VC986 is limited to 4K at 30 Hz, while the ATEN VC986B (S$76.00) is an active adapter rated for 4K at 60 Hz with HDMI 2.0 and HDCP 2.2, and works even when the PC's DisplayPort output lacks dual-mode (DP++) support. A 4K monitor on a 30 Hz adapter feels sluggish when you move the mouse. VESA's FAQ also recommends a DP-certified adapter cable for USB-C connections.

How long can a display cable be?

Use the shortest cable that reaches comfortably. For 4K runs beyond 5 m, ATEN's HDMI listing advises a booster or extender rather than a longer passive cable. For a ceiling projector or a wall display across a room, an HDBaseT extender such as the ATEN VE811 (S$537.80) sends HDMI over a single Cat cable: up to 70 m at 4K over Cat 5e/6 and 100 m over Cat 6a, per ATEN's specification. For long USB runs to room cameras, see Logitech Extend vs Swytch vs Active USB Cable.

For the wider desk picture, our tips on equipping your office for hybrid work in Singapore pull the pieces together.

Buying display cables and adapters in Singapore

SourceIT supplies ATEN with local warranty; the listings above state a 2-year local carry-in warranty. Browse the ATEN KVM, AV and connectivity collection, or send us your laptop and monitor models and we will match the cables. Call (65) 6978 3502, email Sales@sourceit.com.sg or use our contact page. Government buyers can procure through GeBIZ; volume pricing is available for office and meeting-room rollouts.

Frequently asked questions

Is HDMI or DisplayPort better for an office monitor? At 1080p or 1440p and 60 Hz there is no visible difference. DisplayPort is usually the better choice for PC monitors because it supports MST daisy-chaining and high refresh rates; HDMI is the better choice for TVs, projectors and meeting-room displays.

Do I need an HDMI 2.1 cable for a 4K monitor? Not for 4K at 60 Hz. HDMI LA certifies Premium High Speed HDMI cables for 4K at up to 18Gbps. You need an Ultra High Speed HDMI cable (48Gbps) for 4K at 120 Hz, 8K or other HDMI 2.1 features.

Why does my USB-C to HDMI cable show no picture? The laptop's USB-C port probably does not support DisplayPort Alt Mode or Thunderbolt. Data-only USB-C ports cannot output video, whatever cable you use.

Can I use a DisplayPort to HDMI adapter the other way round? Usually not. Most adapters are one-way, from a DisplayPort source to an HDMI display. Check the direction in the product name before buying.

Why is my 4K monitor stuck at 30 Hz? A common cause is a cable or adapter rated only for 4K at 30 Hz, such as a High Speed HDMI cable or a 4K30 DisplayPort to HDMI adapter. Swap to a 4K60-rated cable or an active 4K60 adapter.