PCI-Express bus extender

The french team of Hardware.fr has done a big test by measuring the real power consumption of 73 graphics cards.

The power consumption of a graphics card is the sum of two powers:

- the PCI-Express X16 power: up to
**75W** - PCI-Express power supply connectors:
- up to
**75W**for the 6-pin version - up to
**150W**for the 8-pin version

- up to

So the max theoretical power consumption of a card can’t exceed 75+75+150 = **300W**.

To measure the power consumption of PCI-Express power supply connectors, just use a voltmeter and and amperometer. To measure the power consumption of the PCI-Express X16 bus, a **PCI-Express bus extender** is required like this one (see picture above).

Two 3D apps have been use to push the cards to the max: FurMark and 3DMark06 (Pixel shader test).

You can compare the results of these tests with the graphics card TDP database.

**FurMark** results in 1920×1200 (Stability test + Xtreme burning mode):

PCI-Express bus extender

**3DMark06** results in 1920×1200

In the dual-GPU cards, the most demanding is the Radeon HD 4870 X2 with more than 320W under 3DMark06 and around 310W under FurMark. The GeForce GTX 295 reaches its maximal power consumption under FurMark with 295W while the Radeon HD 5970 exceeds 300W under FurMark.

In the single GPU cards, the GeForce GTX 275 is one of the greedy…

The complete test is available HERE in french.

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The gtx275 numbers match my measurements. Greedy, indeed.

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wow i knew the HD5770 sucked very little just didn’t know it was so little

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Pingback: Anonymous

Any chance of updating the graphs with the figures of what was drawn through the PCIe slot and what was from the connectors? would be very useful when considering PSU rails.

forget my last comment, just checked the french site, very interesting

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