Can't overclock i7-5775C on Z97 Extreme9

Nope that did not help me at all. Still having the same issue. I can see the default values of Broadwell (roughly 80W as Short Time Power Limit and 65W as Long Time Power Limit; the only thing that apparently does get changed is the Ampere limit).

I know its unrelated to the OP motherboard but also lowering the TDP targets on v1.80 BIOS and Z97M Killer does not work (stays at the processors default Values on my i5-5675C)

BTW same issue on Z97M Killer - only Intel XTU can raise the TDP to keep CPU from power throttling my Broadwell (I5 5675C)

Try this: Download and install the Intel Extreme Tuning Utility (IXTU), found here:

https://downloadcenter.intel.com/download/24075/Intel-Extreme-Tuning-Utility-Intel-XTU-

Open the main over clocking control screen, which will contain some of the same controls in the UEFI/BIOS. You must have the Intel Management Engine software for your board installed to allow you to change the settings in IXTU.

You'll find the long and short duration power limit settings in IXTU, as well as the maximum current allowed to be applied to the processor. You can change the core multipliers, BCLK, and CPU voltages.

In the lower right side of the screen, there are many processor attributes that can be monitored, including TDP. Most of them are not shown by default. Click on the little wrench icon within the display box, and a list of all the options will appear. Check those you want to monitor, particularly the TDP readings.

IMO, IXTU is a great tool, but it might also give you some bad news. For Broadwell processors (I don't have one) IXTU should display a Configurable TDP control. That will not appear for other processors, since their TDP cannot be adjusted, and their TDP is not limited to the rated TDP.

Either the configurable TDP option (if it exists, I hope it does) or the TDP reading shown in the monitoring options, will likely tell you if you will be able to exceed and/or adjust the specified TDP. That will be the good or bad news.

Intel refers to the configurable TDP as "Configurable TDP-down". That worries me, since it implies that the TDP may only be adjusted lower. See that for yourself on your processors Specification page:

http://ark.intel.com/products/88040/Intel-Core-i7-5775C-Processor-6M-Cache-up-to-3_70-GHz

If you find some options displayed by grayed or dimmed compared to the others, those options are not adjustable with your processor. It is rare for every option to be open to modification, so don't be to concerned if you see a few of the options like this.

Please let us know what you can or cannot do within IXTU with your Broadwell processor. We don't have many Broadwell users that have posted their experience with them here. At least I am very interested in what they are all about.

I wish you luck in your over clocking quest!

Try this - save, and then re-enter and try overclocking: