Thermal throttling issue with the 7700x and NHD15S chipset, despite a hot CPU and adequate heatsink.
Thermal throttling issue with the 7700x and NHD15S chipset, despite a hot CPU and adequate heatsink.
I see your concern. The added IHS layer for better cooling isn't providing the expected benefit. A simpler approach could be reducing the IHS thickness by about 1.2mm. Before proceeding, it would help to calculate the impact on the design details.
You're checking the temperature at a specific spot to determine the 31*C reading. Is it taken from the baseplate of the NH-D15S where the heatpipes meet? That location is quite different from the 95*C point you mentioned, since the heat is already inside the heatpipes and spreading through the fin array. Around 200W on a small CPU is much more intense than the same amount spread across a larger heatsink. The challenge lies in the fact that Intel and AMD are focusing on higher CPU speeds and more cores. Take the i9-13900KS as an example—it can reach up to 6.0 GHz out of the box, labeled at 150W, but with that boost it can hit 253W. Simply throwing a lot of power into the CPU isn't the solution. The TDP values given by both manufacturers are just estimates. Your Xeon E5-2690 reads around 140W, while the i9-13900K can push even higher, with some AIOs reaching over 100*C.
the power readings I mentioned come from Ryzen Master and Intel XTU. I’m puzzled about why my older CPU, which uses similar power (around 140w at peak) and has a smaller heatsink, stays cooler by 35°C compared to the 7700x. Don’t misunderstand, it’s actually four times faster than my Xeon, but the thermal behavior is confusing for me.