Page 1:The Radeon's GCN Is Updated Again: The Tonga GPU
Page 2:Asus Strix Radeon R9 285
Page 3:Gigabyte R9 285 WindForce OC
Page 4:Test Setup and Benchmark Suite
Page 5:Synthetic Benchmark Results
Page 6:Titanfall and Battlefield 4 Results
Page 7:Thief and Arma 3 Results
Page 8:Grid Autosport and Assassin's Creed IV Results
Page 9:Watch Dogs and Far Cry 3 Results
Page 10:Idle Power Consumption Results
Page 11:Gaming Power Consumption Results
Page 12:GPGPU Power Consumption Results
Page 13:Temperature and Noise Results
Page 14:Radeon R9 285 Holds its Own at $250
Gaming Power Consumption Results
Power Consumption: Gaming Loop
For the gaming lop measurements we firstwarm up the graphics card for 20 minutes until a stable GPU temperature of 64 degrees Celsius has been reached. At this point we proceed to measure the card’s power consumption again. Our gaming loop is relatively challenging for the GPU, so we’re confident that the average 176 W we measured is a good representation of today’s demanding game engines. less demanding titles should draw between 165 to 170 Watts depending on the particular title, of course.
Once again, lets focus on just one minute of the smoothed curve. This shows us that the way the load is distributed between the PCIe and the motherboard power connectors conforms to the applicable norms.
The control exercised at the motherboard slot is reassuring. There’s never a sustained load that exceeds the slot’s maximum 75 Watt rating.
Let’s take a look at how the 176 W of power consumption while gaming are split in the table.
|PCIe 12V||33 W||209 W||124 W|
|Motherboard 3.3V||3 W||7 W||5 W|
|Motherboard 12V||9 W||93 W||47 W|
|Graphics Card Total||47 W||290 W||176 W|
List of All Individual Values per Supply Line
Again, we’ve put together all power consumption values for each supply line in a handy gallery.
The average voltage is exactly 12 V, just like it was at idle. However, the fluctuations are present and accounted for as well.
The Gigabyte R9 285 WindForce OC and its 176 W for gaming comes in almost 40 W lower than a moderately overclocked AMD Radeon R9 280 reference graphics card, which also provides slightly lower performance on average. When we referenced the Gigabyte R9 285 WindForce OC’s efficiency on the graphics cards in our 2014 VGA charts, it looks like it’s comparable to Nvidia’s older Kepler-based GeForce GTX 760. If winning the efficiency war was the goal, then it most certainly hasn’t been reached, but at least AMD was able to catch up. This probably won’t be enough to compete with Maxwell, though.
- The Radeon's GCN Is Updated Again: The Tonga GPU
- Asus Strix Radeon R9 285
- Gigabyte R9 285 WindForce OC
- Test Setup and Benchmark Suite
- Synthetic Benchmark Results
- Titanfall and Battlefield 4 Results
- Thief and Arma 3 Results
- Grid Autosport and Assassin's Creed IV Results
- Watch Dogs and Far Cry 3 Results
- Idle Power Consumption Results
- Gaming Power Consumption Results
- GPGPU Power Consumption Results
- Temperature and Noise Results
- Radeon R9 285 Holds its Own at $250