Power Consumption and Temperatures

We measure CPU power consumption since one of our first tasks is to truly verify system stability. I isolate the power coming through the 8-pin ATX connector with an in-line meter that provides voltage and current readings and total wattage passed through. While this may not isolate CPU power draw in all instances, it does serve as a good indicator of board efficiency and effective VRM design. Total system power consumption is no longer reported as this figure can change depending on which VGA is installed. The sole board-only power measurements possible without physically modifying a motherboard are those taken via the 8-pin CPU connector, making it the only figure of value worth reporting. I use wPrime with eight threads selected in its options since it provides a consistently high workload throughout the full length of the test and runs long enough for the VRM and CPU to produce a fair bit of heat. Most average workloads will draw far less than that, although distributed computing applications are quite similar. This is not supposed to test stability since I use several other applications to do so, but merely serves to provide repeatable power draw numbers anyone can replicate. The meter used is an off-the-shelf Zalman unit that has been on the market for some time. In my test environment, it provides results similar to a FLUKE 337 clamp meter.

Fan Control

*Fan speed is controlled by temperature, actual minimums dependent on fan ability.


There are five 4-pin fan headers included on the ASRock Fatal1ty X99 Professional Gaming i7. Their locations are pretty good, although two of them make for a bit of a wiring mess above the edge of your installed VGA.


The fan-control options are pretty good, with some simple settings available on the primary BIOS page and more detailed options to be had inside the "Advanced Mode" the BIOS provides. ASRock provides a simple "Fan-tastic Utility" that will measure the capabilities of your fans to then set all the fans up for you, making it super easy to get any fan set up just right.