Hey there sir LeoC
With all due respect, I'm not entirely sure whether You're trolling, or really don't know. The question/topic is pretty obvious, eventhough people in the topic itself can't correctly name what they want. The question is, whether 9400f uses the same iridium type solder upon gold plated ihs as for example 9900k, and most likely other 9xxx cpus. The solder question regards the ihs vs. silicone die iridium solder, NOT in any case integration of cpu itself to system board.
Hope this helps explain the situation sir
With kind regards