This article provides information on the maximum length Dell recommends for DisplayPort cables to ensure optimal performance.
When using display port cables the length of the cable can greatly impact display quality and create data loss. While DisplayPort offers support for cables of varying lengths, the maximum cable length that Dell recommends for optimal performance is 1.8 meters (around 6 feet). Using a DisplayPort cable beyond 1.8 meters in length may cause data loss and a negative impact to display quality.
For more information concerning DisplayPort technology, refer to the Dell Knowledge Base articles below: