Just opened up my replacement AW 15 R4 because the past three AW 15 R3s reached extremely high temperatures. I open the new one and this is what happens. It got so hot it shut down after not even a minute of gaming.
As the coffeelake processor supports higher clock rate than kabylake or older processors, you may easily notice that the Alienware 15 R4 / 17 R5 generates more heat compared to previous generation platforms. Therefore Dell engineering optimized the system to tolerate higher temperature from design perspective, and the new specification for Alienware 15 R4 / 17 R5 is:
CPU peak temperature will be no greater than 100 degree C
CPU average temperature will be equal or less than 95 degree C
Anything under these figures will be normal for the Alienware 15 R4 / 17 R5.
Dell | Alienware Technical Support
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And how long will the system operate at 95C before the motherboard gets cooked completely? That's what's happened to each of the replacement laptops I receive. Sure, they CAN operate at 95C, but it will only continue to function normally for a week until the system as a whole begins to fail.
Same thing happens with my Alienware 15r3. Dell shipped me a replacement laptop that overheats more than the original one. Average temp of 99 degrees!
I have to report that my AW 15 R4 is performing great, thermally. I have the i9 chip, which runs into power limit throttling but that is it. To reduce the power limit throttling, I undervolted by 130mv, and with that, when running heavily threaded applications I average between 75 - 80 c with fans in the quiet profile!
Maybe I won the silicon lottery with this CPU?