(Tested and Burned) ASUS GeForce GTX 680 DirectCU II TOP Review



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5 – GTX 680 DC2 TOP Burn-in Test

ASUS GeForce GTX 680 DirectCU II TOP, MSI Kombsutor Burn-in test



The aim of the burn-in is to reach the maximal GPU temperature and power consumption. The burn-in test allows to test the efficiency of the cooling system as well as the quality of the power circuitry.

For this burn-in test, I use a new stress test that will be released soon. This stress test will be available in MSI Kombustor and mixes fur rendering with tessellation. This stress test is particularly well adapted to burn the GTX 680. It stresses the GTX 680 harder than FurMark!

To burn the GTX 680, I set the power target to its maximum: 159% TDP using ASUS GPU Tweak:

ASUS GPU Tweak



Then I launch a burn-test session with the new OpenGL 4 stress test in 800×600 windowed mode. Here are the values of the different parameters after a burn test of 5 minutes:

- total power consumption of the testbed under load: 355W
- GPU temperature: 80°C
- GPU clock: 1201MHz
- Power consumption: 120% TDP
- GPU usage: 99%
- GPU current (read with GPU-Z): 72A under a voltage of 1.107V.

At idle state, the total power consumption of the testbed is 65W and the GPU temperature is 31°C.

If we approximate the power consumption of the CPU by around 20W when the stress test is running, we can get the power consumption of the GTX 680 DC2 TOP alone:
P = (355-65-20) * 0.9 = 243W

Under this highly stressing situation, the DirectCU II cooler is a bit audible but remains quieter than the VGA cooler of the reference board.

As you can see, the power consumption does not exceed 120% even if the power target is set to 159%. It’s probably because in this situation, 120% corresponds to the TDP of the GTX 680 DC2 TOP and NVIDIA hardware monitoring does its job by keeping the TDP in under its max value.

Let’s see now how the GTX 680 reference board handles this stress test (I set the power target to 132% TDP):
- total power consumption of the testbed at idle: 60W
- GPU temperature at idle: 33°C
- total power consumption of the testbed under load: 305W
- GPU temperature: 87°C
- GPU clock: 992MHz
- Power consumption: 125% TDP
- GPU usage: 99%
- GPU current: not exposed by GPU-Z.

As you can see, the DirectCU II does a good job, keeping the GPU temp at a max value of 80°C while the ref board reaches 87°C. But the difference of 7°C is not really impressive and we are far from the marketing slogan: 20% cooler…



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