It all depends on your personal needs. Do you need the final resolution and refresh rate to be at least 4K@60Hz? Do you need an extra long cable for your home theatre setup? Are you trying to convert DisplayPort into another interface (HDMI, for example)?
IVANKY 16K Displayport Cable 2.1 Short DP Cable 3.3ft 16K 60Hz 8K
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DisplayPort (Male) to HDMI (Female) Converter 4K@60Hz Active
Mini Displayport To Mini Displayport Cable, 4k 60hz Mini Dp Cable
IVANKY DisplayPort Cable 3ft/1m, Short DP to DP Cable 3.3ft, [4K