I just purchased and installed this CPU and after reading many posts across the web, immediately changed BIOS settings to disable Turbo mode, as heat was indeed going up. I am disappointed that I can't use the processor to its full capacity, but at least it is stable and fast enough for what I do (mostly gaming and video rendering). My specs are as follows:
Windows 8.1 64 bit
Motherboard: GIGABYTE GA-Z97X-Gaming 5 (rev. 1.0), latest F5 BIOS installed
Core i7 4790K running @stock 4Ghz (with Coolermaster Hyper 212 HSF)
8GB (2x4GB) Patriot 1600 DDR3
Sapphire R9 290X 4GB
Crucial M500 256Gb SSD