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#11
The difference is usually the quality of the materials used in the cable. Example the qualty of wiring used and the tubing can be fabric instead of just rubber. Analogue items like an audio cable usually benefit from the cables but with digital signals its nearly always the same. The only main reason you need a high quality cable in my opinion is for sensitive equipment which needs to be fine tuned.
This DP cable should do fine Display Port DP Cable Male to Male Displayport 6ft 1.8m | eBay
Have a look at ones in a similar price range.