
The non-K series is 65W TDP, while the K and KF models will officially go up to 125W. This value is obviously not equal to actual power consumption, as that is expected to go higher.

So when can we expect the launch of the Core i5-10400? According to a leaked launch schedule slide posted at Uniko's Hardware, we can expect a pretty long launch window. The press news embargo is listed as April 13 - June 26, 2020. This means a launch can happen as early as next month or after Computex (if that event is still a go, which is increasingly unlikely due to the novel coronavirus outbreak).
Source: VideoCardz