The cooling system installed on the ASUS EN7950GX2 consists of two standard flat coolers. In spite of their low profile, they do their job well enough thanks to the copper cores that have contact with the GPU dies and to the heat pipes that make sure the heat is distributed uniformly in the heatsinks. The coolers’ task is simplified by the relatively low heat dissipation of the G71 chips clocked at a reduced frequency. There is a layer of dark-gray thermal grease between the coolers and the GPUs; the memory chips have contact with the heatsink through special pads that consist of two pink-colored halves and a layer of white thermal grease in between. The fans of the coolers have a green LED-based highlighting.
The deficiencies of the cooling system installed on the GeForce 7950 GX2 come from the cramped dual-PCB design of the card which makes it hard for at least one of the coolers to work. As opposed to the GeForce 7900 GX2, there are no slits in the PCBs of the GeForce 7950 GX2, so the bottom fan, situated very close to the top PCB, has problems getting enough air. This may eventually lead to overheat of the bottom GPU.
We had to face the problem of overheat closely this time around, unfortunately. Although the testbed was ventilated well, the bottom fan on one sample of the GeForce 7950 GX2 we used for our tests failed suddenly. For some reason, the card’s overheat protection didn’t work and the temperature of the bottom GPU jumped up so high that you could smell the rosin. Rosin melts at about 100-120°C, so that’s how hot the PCB around the graphics processors could have been! Luckily, the card survived through that catastrophe.
We won’t claim that the fans on GeForce 7950 GX2 cards are prone to fail, but this may happen anyway, especially if dust accumulates in the gap between the bottom cooler and the top PCB. It’s difficult to replace the GeForce 7950 GX2’s cooler with something more efficient due to the peculiar design of the card, so we can only recommend that you check out and clean its cooler regularly.