Quick Answer

DisplayPort cables are defined by version number, bandwidth tier, maximum resolution and refresh rate at that bandwidth, and certified passive cable length. DP 1.4 supports 4K/144Hz natively or 4K/240Hz with DSC; DP 2.1 UHBR20 supports 8K/60Hz natively and 4K/240Hz without DSC. Passive cables are certified to 2m for DP 2.1 and 3m for DP 1.4.

Resolution and Refresh Rate Across DP Versions 📡

DP 1.2 (17.28 Gbps): 4K at 60Hz, 1440p at 165Hz, 1080p at 240Hz. DP 1.4 (32.4 Gbps): 4K at 120Hz native, 4K at 144Hz with minor DSC, 4K at 165Hz or 240Hz with DSC, 8K with heavy DSC. DP 2.1 UHBR10 (40 Gbps): 4K at 240Hz native, 8K at 30Hz native. DP 2.1 UHBR13.5 (54 Gbps): 4K at 240Hz with HDR native, 8K at 60Hz with DSC. DP 2.1 UHBR20 (80 Gbps): 8K at 60Hz native with HDR, 4K at 240Hz native with 12-bit HDR. These figures are for standard uncompressed output. DSC (Display Stream Compression) extends effective bandwidth but introduces a compression step. For gaming, DSC artefacts are invisible. For calibrated creative work, native uncompressed output is preferred.

Bandwidth Tiers Explained in Plain Language 🔧

Think of cable bandwidth as a pipe. DP 1.4 has a 32.4 Gbps pipe. At 4K/60Hz, the resolution data flow is around 12 Gbps: the pipe is well undersized. At 4K/144Hz, the data flow is around 30 Gbps: the pipe is nearly full and DSC is needed to handle the occasional overflow. At 8K/60Hz, the data flow is around 48 Gbps: DP 1.4's pipe is too small even with DSC at full compression efficiency, resulting in image quality reduction. DP 2.1 UHBR20's 80 Gbps pipe handles 8K/60Hz at around 60% capacity with 10-bit HDR, leaving headroom for clean uncompressed output. The conductor gauge and shielding inside the cable determine whether the pipe can maintain rated capacity over its full length and under sustained load.

Length Specifications and Active Cable Options 📐

VESA certified passive length limits: DP 1.2 up to 5m, DP 1.4 up to 3m, DP 2.1 UHBR20 up to 2m. These limits apply to passive copper cables. Active cables use integrated circuitry to boost signal strength, allowing longer runs. Active DP 1.4 cables operate to 5m reliably. Active DP 2.1 UHBR20 cables operate to 5m or beyond. Fibre-optic DisplayPort cables push these limits further, reaching 10m to 30m for installation and AV applications. For SA gaming and workstation setups, 2m passive cables cover most desktop configurations, and 3m active cables cover extended desk layouts and room-to-room PC placement setups. Active DP 2.1 cables start from around R750 to R1,200 locally.

TIP

Read the VESA Certification Number, Not the Box Artwork ⚡

Certified DP cables carry a VESA certification number that can be checked against the VESA database. This number is more reliable than bandwidth claims printed on the packaging. When purchasing a high-spec cable for an 8K or 4K 240Hz setup, ask for the certification number or look for it in the product listing.

FAQ

What DP version do I need for 1440p at 165Hz?

DP 1.2 handles 1440p at 165Hz without issues. A DP 1.4 cable works equally well at this resolution. If your monitor is 1440p at 165Hz, any DP 1.2 or higher certified cable is sufficient.

Can DP 1.4 handle 4K at 240Hz for competitive gaming?

Yes, using DSC. DP 1.4 with Display Stream Compression supports 4K/240Hz on compatible monitors. The compression is perceptually lossless and produces no visible image quality loss in gaming conditions.

What is Multi-Stream Transport and does it affect cable choice?

MST (Multi-Stream Transport) allows daisy-chaining multiple monitors through a single DP connection using a hub or MST-capable monitors. The cable connecting the GPU to the first monitor must carry the combined bandwidth for all displays in the chain. For MST setups, DP 1.4 is the minimum recommended standard.

Want to match your cable spec to your exact resolution and refresh rate target? Evetech stocks certified DisplayPort cables for every resolution tier from 1080p gaming to 8K creator setups. Browse the full range at Evetech.