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Power Consumption: Introducing Our Equipment

Radeon R9 295X2 8 GB Review: Project Hydra Gets Liquid Cooling
By , Igor Wallossek

Three Generations Of AMD Dual-GPU Cards, Compared

Naturally, we're going to compare the power consumption of AMD's Radeon R9 295X2 to other CrossFire- and SLI-based setups. But first, we want to use our high-end equipment for a little experiment, comparing the company's newest dual-GPU card to its predecessors. The point is to figure out whether AMD is moving in the right direction with its flagship cards.

Meet Our Test Equipment

Our power consumption test setup was planned in cooperation with HAMEG (Rohde & Schwarz) to yield accurate measurements at small sampling intervals, and we've improved the gear continuously over the past few months.

AMD’s PowerTune and Nvidia’s GPU Boost technologies introduce significant changes to loading, requiring professional measurement and testing technology if you want accurate results. With this in mind, we're complementing our regular numbers with a series of benchmarks using an extraordinarily short range of 100 μs, with a 1 μs sampling rate.

We get this accuracy from a 500 MHz digital storage oscilloscope (HAMEG HMO 3054), while measuring currents and voltages with the convenience of a remote control.

The measurements are captured by three high-resolution current probes (HAMEG HZ050), not only through a riser card for the 3.3 and 12 V rails (which was custom-built to fit our needs, supports PCIe 3.0, and offers short signal paths), but also directly from specially-modified auxiliary power cables.

Voltages are measured from a power supply with a single +12 V rail. We're using a two-millisecond resolution for the standard readings, which is granular enough to reflect changes from PowerTune and GPU Boost. Because this yields so much raw data, though, we keep the range limited to two minutes per chart.

Methodology
Contact-free DC measurement at PCIe slot (using a riser card)
Contact-free DC measurement at external auxiliary power supply cable
Voltage measurement at power supply
Test Equipment
1 x HAMEG HMO 3054, 500 MHz digital multi-channel oscilloscope
3 x HAMEG HZO50 current probes (1 mA - 30 A, 100 kHz, DC)
4 x HAMEG HZ355 (10:1 probes, 500 MHz)
1 x HAMEG HMC 8012 digital multimeter with storage function
Power Supply
Corsair AX860i with modified outputs (taps)
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  • 0 Hide
    Paolo Cardinale , 8 April 2014 14:13
    Mantle's bench???
  • 1 Hide
    AMD Radeon , 8 April 2014 15:07
    good guy AMD
  • 0 Hide
    Motoxyogi , 9 April 2014 08:58
    Good writeup.Just a heads up, the 100 microsec gaming power consumption graph for the 295X seems to have the wrong peak total value
  • 0 Hide
    olafgarten , 18 April 2014 08:35
    IT USES ASETEK. KILL IT WITH FIRE!
  • 0 Hide
    PlanetCreation , 20 April 2014 11:36
    Would this be a overkill for 1080p gaming?