Nvidia Quadro RTX 4000 review - low-cost professional offshoot with surprising performance | igorsLAB | Page 10

Temperature gradients and boost clock in detail

Of course, manufacturers are reluctant to talk about these details when it comes to workstation cards, but I think they are very important. The base clock given with 1 GHz is quite low, so you should already know what could be done with such a card in the closed housing. Because the cooling in the housing also decides on the performance of this card and my example setup is with the fullest intention rather located at the less favorable end.

Without any real load and with a cold card it is already a short time 1920 MHz, but this is and remains a pipe dream. Under load and fully warmed, the boost clock is leveled at about 1470 to 1485 MHz, at half the force it is already up to 1560 or even 1575 MHz. More is simply not possible due to the low power limit and the resulting low voltages. But it's easy enough to make the card perform properly.

In the render loop, the card even buckles slightly below the base clock of 1005 MHz, which still ensures good results.

And now the whole thing again in sober numbers in table form:

	Initial Nvidia Quadro RTX 4000	Final value Nvidia Quadro RTX 4000
Open Benchtable
GPU Temperatures	51 °C	80 °C
GPU clock	1920 MHz	1485 to 1500 MHz
Ambient temperature	22 °C	22 °C
Closed Case
GPU Temperatures	51 °C	82°C
GPU clock	1920 MHz	1460 MHz to 1475 MHz
Air temperature in the housing	24 °C	40 °C

Board Analysis: Infrared Images

The following infrared images show the 3D and render loops in the closed enclosure. The differences are hardly visible and the cooler acts audibly, but also more or less confidently. Of course, the maximum measured 123 or 127 watts also nothing you could not cool with a wet finger