To get to 4.5 GHz Stable I have to go to 1.33V and temps remain just under 70°. From what I understand even on low temps going above 1.3V is going to severely shorten the CPUs life expectancy.
The following settings seem to have absolutely no effect on stability:
* Setting CPU input voltage to between 1.9-2.1 * Changing CPU cache Multiplier * Setting CPU cache voltage to 1.25 * CPU Load-Line Calibration, high or low doesn't matter
So some questions:
* There is one obvious part missing from my system that most overclockers have, that being a Discrete Graphics card. Could that be causing stability issues?
* I don't think my RAM is meant for overclocking but can that effect CPU clocks?
* Motherboard isn't a specialist overclocking board but still a good board, would or could that make much of difference?
* When going into device manager on Windows, ang getting driver details on the CPU it's states that the provider is Microsoft and date is 21/04/2009. I've updated manually, used Intels update software and always get told I'm up to date.
Now, I’ll share a secret imparted by the folks at ASUS who gave several reviewers some tips on overclocking the retail stepping Haswell chips: Set Vcore to 1.20 V. Set all cores to 46x (which would be a 4.6 GHz overclock), save & reboot. If the system boots past the UEFI and either begins to load or, ideally, makes it into the OS and is stable, you have a 50th percentile or greater chip on the Haswell overclocking-ability bell curve. If it won’t at least boot there and make it into the UEFI, you probably have less than a 50th percentile chip. You can expect chips in the lower 50th percentile to top out in the 4.4-4.5 GHz range at 1.25 V.
As you can see in that guide my temp profiles are completely different to what they are getting.
So can anyone provide thoughts on what is happening? Or are there more Haswell chips that behave like that this that I'm not aware of?
More about4670k 4ghz high voltages needed low temps questions
Just thought I should mention that I'm Overclocking in the Bios and using PRIME95 small FFts for stress test.
Also system seems less stable when using BLCK to achieve same frequencies.