I just purchased a new i7-4790K on amazon along with an Asus z97M motherboard and have the exact same problems. I can't even start a web browser with the stock CPU cooler. It immediately spikes the temp to over 100°C. Everything is at stock default settings and the idle temp is 40°C but quickly rises the second any application loads and the system fans increase to max speed. I've tried lowering Vcore to 1.190 and that helped a little. I installed a Noctua NH D14 with no improvement so there was obviously something more wrong than just the type of CPU cooler. Even the stock BIOS optimization would cause a reboot. I've researched this problem and have found various threads relating to it and it seems to happen with any motherboard so I've ruled out motherboard and BIOS setting as the source of the problem. I tried reseating the cooler 3 times with AS5 with no improvement. Also the Noctua heatsink is not getting very warm for the amount of heat the BIOS is reporting so the cooling failure has got to be chip related. I went ahead and voided the warranty and de-lided the chip and sure enough, I could see what the problem was. The glue holding the lid on was very thick and there was almost no white TIM compound on the chip. I cleaned it up, reapplied compound to the chip , set the lid back on and reinstalled the CPU cooler. Fired it up and problem solved. Idles at 26°C . I set the BIOS to optimize and it did an OC to 4.6Ghz and runs intel burn test on Max settings between 58°C and 90°C.
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