German computer site HT4U has tested the real maximum power consumption of the latest graphics cards from ATI and NVIDIA. The site measured the power draw from the PCI Express slot and the PCIe 6/8-pin connectors and used FurMark because this benchmark creates a much higher power consumption than other tools.
The Radeon HD 4870 X2 was the biggest power hog, this card consumed 373.1W even though the TDP is only 286W. The GeForce GTX 295 has a slightly higher TDP of 289W but consumed only
316.5W. You can check it out over here
. In some cases the power draw is a lot higher than the TDP but we have to admit that real-world tests will never consume as much power as FurMark.