Adjusting processor speed to a lower limit (underclock)
Adjusting processor speed to a lower limit (underclock)
Hello everyone. I’m sharing my experience using an Alienware 15 R4 (Intel Core i7-8750H @ 2.20GHz). As you’re aware, Alienware can sometimes struggle with temperature management. I’ve adjusted some software settings—Intel XTU and power controls—but I’m encountering unusual behavior. Certain games cause the core frequency to spike sharply, which raises the temperature.
I’m considering implementing a maximum frequency setting and gradually lowering it until I achieve a stable balance between performance and heat. From my research, I found discussions about modifying “maximum processor state” in the power options. Changing this value does restrict the peak frequency when no program is running, as confirmed by testing with a very low setting. However, once a game starts, the frequency rises rapidly.
This prompted me to explore BIOS settings. Since my BIOS doesn’t offer any core frequency controls, I attempted to enable or disable SpeedStep and Speed Shift in the BIOS. Disabling SpeedStep locked at 2.20GHz when a game starts, but allowed it to drop when inactive. Turning off Speed Shift kept my frequency steady at 2.20GHz.
The challenge remains: gaming performance is poor when SpeedStep is off (max 2.20GHz), suggesting there’s a better way to find an optimal setting. How can I set a higher maximum frequency, say around 3GHz? Any advice would be greatly appreciated!
You want to reduce the maximum turbo frequency from 4.1Ghz to 3Ghz. You're deciding whether to keep it active or disable it entirely. If kept active, you won't get steady clock speeds of 4.1Ghz, but you'll likely approach your 3Ghz goal as the chip warms up. To extend the laptop's life, simply turn off Turbo Boost. With laptops, balancing performance and longevity isn't possible.
Adjusting the CPU frequency cap to 99% in Windows Power Settings appears to effectively turn off turbo... which is unusual. You should have more control within XTU as well. It seems counterintuitive that you can't manage this. What temperatures are you observing? 80-90°C is typical for laptops.