At idle, the NAND measured roughly 40 degrees Celsius, and the controller measured 50 degrees Celsius. We tested the SSD in a 24 degrees Celsius room, and the 980 Pro remained fairly cool during moderate use. That is why Samsung's DTG works in conjunction with a temperature sensor in the controller and the NAND to keep temperatures in check while assuring high levels of performance. With high-performance and high average power draw comes the concern of overheating if you put the 980 Pro into a heavy production environment. However, the 980 Pro consumes very little power, just 30mW, after enabling the feature. Idle power consumption is high when ASPM is disabled, too. That's because Samsung's 980 Pro draws more power on average, and its peak power consumption is much higher due to its higher channel count. In fact, it scored over 80 MBps-per-watt higher than the 980 Pro. SK hynix's Gold P31, with its quad-channel controller and 128-Layer 4D NAND flash, is much more efficient. However, the 980 Pro isn't the most efficient choice at the 500GB capacity point. That comes courtesy of Samsung's migration from 14nm to an 8nm manufacturing process node for the controller. Samsung's 980 Pro touts incredible efficiency gains over the 970 EVO Plus. Bear in mind that results will vary based on the workload and ambient air temperature. We also monitor the temperature of the drive via the SMART data and an IR thermometer to see when (or if) thermal throttling kicks in and how it impacts performance. A drive might consume more power during any given workload, but accomplishing a task faster allows the drive to drop into an idle state faster, which ultimately saves power. Average workload power consumption and max consumption are two other aspects of power consumption, but performance-per-watt is more important. Some SSDs can consume watts of power at idle while better-suited ones sip just milliwatts. Idle power consumption is an important aspect to consider, especially if you're looking for a laptop upgrade. We use the Quarch HD Programmable Power Module to gain a deeper understanding of power characteristics. While the static 6GB cache recovered immediately, the 'Intelligent' dynamic cache did not recover within a half-hour idle window. Cache recovery is on the slower side, however. Once its cache filled, write speed averaged 1 GBps until full, outwriting the competition. Samsung's 980 Pro sustained 100GB of writes to its TurboWrite cache at a rate of 4.5 GBps before performance degraded. You have to be careful when filling up the 980 Pro because it will do so quicker than you might expect. We also monitor cache recovery via multiple idle rounds. We use iometer to hammer the SSD with sequential writes for 15 minutes to measure both the size of the write cache and performance after the cache is saturated. Sustained write speeds can suffer tremendously once the workload spills outside of the cache and into the "native" TLC or QLC flash. Most SSDs implement a write cache, which is a fast area of (usually) pseudo-SLC programmed flash that absorbs incoming data. Official write specifications are only part of the performance picture. Sustained Write Performance and Cache Recovery Random write performance is a little slower than some of the competition, but Samsung's 980 Pro still delivers respectable results. Responding to 4K random requests at 0.046 ms, it delivered over 21K IOPS at QD1 and hit upwards of 600,000/530,000 random read/write IOPS at QD128. Likewise, the Samsung 980 Pro's performance in random workloads is very impressive. However, with smaller file sizes at a queue depth of 1 (QD1), the 980 Pro's sequential performance is similar to PCIe 3.0 SSDs. Peak sequential performance results come in at roughly 7/5GBps of read/write throughput, as rated. Again, with its incredible bandwidth potential, Samsung's sequential performance absolutely blows past the competition at larger file sizes.
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