More correctly there is no such thing as an 115X socket. That is a term for compatible coolers for any of the following:
LGA1156 (1st generation Core series, i5-760 and the like)
LGA1155 (2nd and 3rd generation Core series, i5-2400, i5-3570 and the like)
LGA1150 (4th and 5th generation Core series, i5-4670 (5th generation only had two limited run CPUs, very rare)
LGA1151 (6th and 7th generation Core series, i5-6600, i5-7600)
LGA1151 v2 (8th generation Core series, i5-8400, no backwards compatibility with 6th and 7th generation hardware)
For proper CPU compatibility you need to get your motherboard model. Try downloading and running CPU-Z to check.