Wow I must have made it all up if they don't existEven if you could get an adapter that converts a DDR3 socket into a DDR4 socket it wouldn't work for several reasons , firstly DDR4 is 288 pins DDR3 is 240 pins , secondly your 4790k memory controller would have a fit, thirdly your bios on the motherboard doesn't have support for DDR4 and finally common sense (DDR3 to 4 adapters don't exist)
That just looks like a riser.
That looks to be something to program the EEPROM.