Q: I have a PC with a DP 1.2 DisplayPort. Is that compatible with the DP 1.4 to 3x HDMI?

Yes, it is compatible. The DP 1.2 DisplayPort still can use the DP 1.4 to 3x HDMI. But, the DP 1.2 bandwidth is lower than DP 1.4, max output resolution will be lower than DP 1.4 spec, not the same as DP 1.4
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