I'm not 100% sure but if the 4690k is hasewell refresh that's probly the issue, there's a thread in the sticky section about things that must be done to the vi line for a 4790k to work since that's the same just a level up you may have to do the same
Maximus vi boards cannot run hasewell refresh without first having a plain hasewell and using the bios updater tool in the os to update the system
And I can't remember exactly but idk if vengemce ram plays nice with the board either
CoolerMaster HAF 932 Advanced/ Maximus VI Formula/ I7-4770K/Swiftech H320/ Corsair HX850/ G.Skill Trident X (2x8) 16gb 2400MHz/ 2x 840 EVO 120gb(Raid 0)/ WD 1TB HDD (Backup/Storage)/ EVGA GTX 1gb 560 TI/ Asus 12x bluray combo