Core i5 processor compatibility with socket LGA1155

... I have a few of Intel DZ68BC LGA1155 desktop boards around the office and I run them with Corei5-2500K processor and it works great.
I recently purchased some additional DZ68BC boards at an auction but I was unable to find the 2500K processor so I purchased corei5-3470 LGA1155 expecting it to be compatible, but it does not work ... this is a version 4 processor,I think ... and the 2500K is a version 2 ... but both are LGA1155. Does anybody know if that is meant to be incompatible ... or do I have some other issues going on ... my new boards run if I use a 2500K processor, so the boards are fine. Many thanks for your knowlwdge...

... thanks ... I thought FCLGA1155 were compatible with LGA1155 ... but it appears like they are not. I am going to research maybe a BIOS upgrade is required.

Layback Bear said:

This Intel web site might help you.
Compatible Processors

... solution is to upgrade to BIOS version 0035 from 0028 ... if you don't have 0028, then you need to upgrade to 0028 before going to 0035 ... according to Intel support .... and we are good to go

... updated BIOS to 0035 so far on three DZ68BC LGA1155 boards and now the FCLGA 1155 Core i5-3470 is working...solution is always so easy when you know the answer ...lol...

kbrady1979 said:

The 3rd gen CPU's like the 3xxx line will work in most 2nd gen 1155 motherboards, and you are right, it just requires a new BIOS to accept the new gen chips. The motherboard specs/features list should tell you if it will work with 3rd gen CPU's. 4th gen CPU's are Haswell architecture and use socket 1150 motherboards.......which means they aren't compatible at all.

Let us know what you find after flashing the updated BIOS on those boards.