The only conductive solutions we tested for this were thermal grizzly’s paste-like conductionaut and Coolaboratory’s Metal Pad. The rest is too delicate in use and of poison for the mostly non-nickel-plated heat sinks. What a supposed copper block can then consist of is also on a completely different sheet. Some alloys look like copper and yet react chemically to the liquid metal products. This may help only a careful test in an unused location. 
For safety reasons, we have generally excluded electrically conductive pastes and liquid metal products from the test. Since the GPUs do not use a heat spreader, but the chip is located directly on the heat sink of the cooler, the risk of running paste or splashes is simply too high and we want to use the card for further measurements. In contrast to the GPU messingen, we use the measured value for the GPU diode in the graphics card, as it remains relatively independent of fluctuations in the (air-conditioned) room temperature, as long as this is in the context of less than 2 Kelvin deviations from the output value 22°C. We have been deliberately using a slightly older card for years, as their cooling solution was very accommodating to our purposes. With only 4 screws for the cooler, a very easy to fix fan speed and the core temperatures, which are still justifiable in the higher range due to the larger structure width, we do not run the risk of the possible failure of the test object in the event of a bad paste. Risk. However, the chip size and achievable surface temperature are roughly what a today’s mid- and upper-class GPU offers.
| Test 4 – Graphics Card Test | |
|---|---|
| Cooler used | Zalman GPU Cooler |
| Fan | Original fan, speed set to 80% fixed |
| Cpu | ATI Radeon HD 4850 |
| Lab | Testystem 1 (see above) |
