will it work on a gigabyte Z97x hd3 mb lga 1150 socket?

Yes, the Intel Core i7 i7-4790K processor has a CPU socket type LGA 1150, which is compatible with the Gigabyte Z97x HD3 motherboard that also has an LGA 1150 socket.

will this work for hp pavilion desktop?

likely not. but it might. it really depends on the socket of the mother board of the computer. it also depends on the wattage

Questions & Answers: Intel Core i7 i7-4790K Quad-core (4 Core) 4 GHz Processor - Socket H3 LGA-1150 Pack CM8064601710501

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Intel Core i7 i7-4790K Quad-core (4 Core) 4 GHz Processor - Socket H3 LGA-1150 Pack CM8064601710501

22nm Devil's Canyon 88W
8MB L3 Cache
Intel HD Graphics 4600

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