X99 OC 100% Thermal Throttling at 25 degrees

I am not new to OCing and this is a new one for me. I am building a video editing machine for a friend. 

And seeings you're using water cooling, can I assume you're making up for the lack of cooling airflow over the VRM sink by positioning an aftermarket 3rd party fan blowing over the VRM sink to cool it?

When water cooling I personally do not rely on case fans. Instead I here use Antec SpotCools directly over the VRM sinks.

Enigma wrote: I am not new to OCing and this is a new one for me. I am building a video editing machine for a friend.  I am using the Asrock X99 OC Formula board, with an i7-5930K. Cooling it with the Swiftech H220-X Before I have even get to over clocking I installed Intel's extreme tuning utility. When I run it thermal throttling is at 100% and the CPU clock stays at 1.2GHz no matter what I do. The core temps are all around 23-27 degrees C. I've restored the default setting in the BIOS, the BIOS is version 1.2 the most recent. I don't see any power management settings, the junction temp cut off is set to 105. The manual actually shows under Voltage Configuration a Power Saving Mode, but I don't see it in the BIOS. Changing the Vcore, CPU multiplier etc has no impact. I've tried everything I know that might cause the CPU to throttle at a low temp to get the CPU to stop thermal throttling. I am at a loss how to fix this. Any help would be greatly appreciated.

You are working with a sophisticated board that has a few options/features that are unusual compared to other boards. I've seen this "issue" with other OC Formula users, and I have a different version, but it has the same option that is most likely causing the problem.

Page 7 of the X99 OC Formula manual shows the mother board layout, which I have included below. Item 14 is the Slow Mode switch, which locks the CPU into its lowest speed, 1.2GHz.

I believe you will find the Slow Mode switch set to On, as it normally is from the factory.



I've always wondered how the Slow Mode switch worked. You may have discovered its secret by running IXTU. Or a side affect of the switch causes Thermal Throttling to be set to 100% when it is set to On.

Be sure to shutdown and shut off power to the PC before you set Slow Mode to Off. It seems you may be able to toggle that particular switch with the board powered up, but I'm not 100% sure that is true.

Don't forget to reset anything you changed in the UEFI when you tried to OC, in case you entered any wild values to see if they would be applied. Once Slow Mode is Off, they will be applied.

If you are still having any issues, let us know.

I think it is meant to be dynamic, as in you can hit the switch if your temps get out of hand during a benchmark or stress test and prevent a crash. The OC formula is heavily optimized for extreme overclocking so it has a number of features that likely only make sense to the extreme clockers that are brave enough to use LN2 etc.  

So sorry for leading you on my goose chase.

Why that's there I don't really know, but it will be remembered.