REAL WORLD FILE TRANSFER
We also wanted to see how performance was in a real-world use when transferring large files to the SSD. For this test, we are going to simply stress write performance by transferring over a 30GB folder of movies off of a 512GB Samsung 950 Pro to the test SSDs and time how long it takes. Once complete we can calculate the average speed.
The new WD Black and SanDisk Extreme Pro averaged 1,373MB/s during the 30GB write transfer. From this result, we do not see the SLC cache exhausting, so this is very good so far.
For our power consumption testing, we have the drive connected to the system as a secondary drive. To record the wattage, we are now utilizing a Quarch Technology Programmable Power Module. It allows us to accurately measure power consumption over time and is flexible enough to allow us to test any SSD that comes our way.
Our power analysis may change as time goes on, but for now, we are looking at just a few metrics with the main goal of measuring our results against the manufacturer’s ratings. Because most consumer systems are at idle for about 80% of the time, idle power consumption is an important measure to look at when understanding the efficiency of a drive.
First up we have our results with Active State Power Management disabled. Here they averaged 1.3W at idle. While this is not the highest result we’ve seen yet, it is still quite a lot of power to draw when doing nothing.
In the chart above, with ASPM enabled, we can see that it consumes about half as much power as when ASPM is disabled, but still, at 0.68W, there is more room for improvement.
Finally, we wanted to post up a graph of the power efficiency of the SSDs in write transfers. We are looking at MB/s per Watt in this graph. The higher the result, the better.
The chart above shows us just how efficient an SSD is in writing data. Here we can see that the new WD Black and SanDisk Extreme Pro average about 385MB/s per watt. This is a very big improvement over the original WD Black and brings these drives to the top of the chart!