DZ87KLT-75K with i7-4790 and I have one and the only problem - Windows restart. This is just ridiculous.
I can see that 4790 not officially supported. But I can tell for sure it was in that list and when suddenly disappeared.
So here is my simple questions for Intel. Is nothing could be done with that? Is this a really big problem for you to make it compatible? Is this a really big difference between 4770 and 4790? Come on...
BIOS 0453 was my last hope and now I'm very disappointed. You are niether make new mobo niether support your latest and the last "bone trail". This is no good!!!