Autonomy and heating
The autonomy of the device has been measured with the PCMark10 battery benchmark. The tested modes are video, productivity and game modes. The power management remained on normal mode and the GPU in hybrid mode except for the video game part where it was in discrete mode (RTX4090 only). The screen brightness was set to 220Cd/m² without HDR and the sound was output via headphones plugged into the GT77 jack.
As we can see, we are not on a champion of autonomy but it must be said that it is doing pretty well with more than 4 hours in video playback or productivity. In video games, you’ll have to use the charger to play in the right conditions because the performance of the device is greatly impacted on battery.
To test the heating of the machine, we started with three distinct tests, first the heating in IDLE, then the heating in CPU load on Cinebench R23 during 10 minutes and finally the heating on COD MW2 in 2160p without DLSS.
The cooling system
On the outside, we have to start with an opening on each side of the right and left of the laptop and at the back a large opening to expel the hot air. Underneath, we have a large grill that allows us to draw in cool air via 4 fans that we see through.
Inside we find the fans, with on the left the one for the GPU and on the right the one for the CPU. These blow air through radiators connected to the chips by heat pipes. 3 large, one medium and one small for the graphics chip and 2 large plus 2 medium for the CPU.
CPU heat only
After 8 min of Cinebench R23
We start with the heating in IDLE and on Cinebench R23 after 10 min of stress. The CPU went up to 96°C during the first minutes before stabilizing around 80°C. The power consumption and frequency went from 185 W and 4300 MHz to 120 W and 3800 MHz during this stress test. On the surface, we note a maximum temperature on the keyboard side of 43°C. As such, this GT77 HX is perfectly well cooled even if an adjustment on the voltages would be very appreciable for this CPU. The undervolt being locked as well as the overclocking on this machine we will not be able to play on this adjustment to consider a drop in the temperatures on the CPU side.
CPU and GPU heat up in game:
In game, we have CPU temperatures quite similar to what we have in CPU-only benchmark during the first minutes. Once the window of time at the maximum power limit is over, the CPU temperatures go back under the 70°C mark. On the GPU side the temperatures are also very well contained with an average of 70°C. The most important thing here will be the use of DLSS on compatible games, if you activate it while keeping a FPS limit (144 Hz in Vsync for example), you can greatly reduce the power consumption and therefore the heating and noise pollution. In the case of Modern Warfare II, it is a gain of 40 W and 5 °C with a graphic rendering just as good.