- Oct 16, 2005
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So I played around with my new XPS 13 (i5-6200U) and Intel's XTU utility while running Furmark and Prime95. During this load, of the 15W available TDT, the GPU used 10W and the CPU only 3W, I guess the remaining 2W are for cache + memory controller. Through it, the GPU ran at 950MHz but the CPU ran at only 1.2GHz due to TDP throttling.
As I gradually undervolted the CPU from -0 mV (dynamic offset) to -90 mV the frequency slowly ramped up to 1.5GHz. Undervolting the GPU to -60 mV brought the frequency up to 1.8GHz by lower the GPU's portion of TDP from 10W to 8W, leaving 2 extra watts for the CPU. The GPU seems perfectly stable at this level, but the CPU crashes past -90 mV.
This will dramatically boost FPS in any game which is CPU bound, but will not affect CPU or GPU loads alone, except to save battery life.
Any other results? If anyone has a Skylake laptop, try undervolting and see how far it goes. Also, I don't think it's possible, but if there's any way to overclock the BCLK on this processor I'd love to hear it, even if I only get from 100 -> 103MHz, that would help.
As I gradually undervolted the CPU from -0 mV (dynamic offset) to -90 mV the frequency slowly ramped up to 1.5GHz. Undervolting the GPU to -60 mV brought the frequency up to 1.8GHz by lower the GPU's portion of TDP from 10W to 8W, leaving 2 extra watts for the CPU. The GPU seems perfectly stable at this level, but the CPU crashes past -90 mV.
This will dramatically boost FPS in any game which is CPU bound, but will not affect CPU or GPU loads alone, except to save battery life.
Any other results? If anyone has a Skylake laptop, try undervolting and see how far it goes. Also, I don't think it's possible, but if there's any way to overclock the BCLK on this processor I'd love to hear it, even if I only get from 100 -> 103MHz, that would help.