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DisplayPort 1.0
It supports a maximum bandwidth of 10.8 Gbps over four data lines.
Technically, it could easily handle a display of 3840 x 2160 or 4k at a refresh rate of 30Hz.
It too has a bandwidth of 10.8 Gbps. No additional changes were made except it had a fiber optic line to curb signal degradation over a longer distance.
It almost doubled the bandwidth up to 21 Gbps and could support maximum resolutions of 2160p at the refresh rate of 60Hz.
It had a whopping 32 Gbps of bandwidth. As compared to DP 1.2, its efficiency increased by 80%. It gave way to high-end gaming resolution by providing 4K UHD @60 Hz and 5k @60Hz. Because of its best performance, all modern graphic cards carry DP 1.3.
DisplayPort 1.4
If you want a smooth 8k video at 60Hzas well as HDR, DP 1.4 must be on your wish list.