We don’t have Samsung’s 2TB 980 Pro as it is still unavailable, but we included the 1TB model and do happen to have WD’s 2TB Black SN850 to throw in against the Sabrent Rocket 4 Plus at the higher capacity point. We also threw in the WD Black AN1500 and SN750, along with the Samsung 970 EVO Plus, Crucial P5, and Sabrent’s Rocket NVMe 4.0 and Rocket Q4.
Game Scene Loading - Final Fantasy XIV
Final Fantasy XIV Shadowbringers is a free real-world game benchmark that easily and accurately compares game load times without the inaccuracy of using a stopwatch.
Sabrent’s 2TB Rocket 4 Plus delivers responsive game load performance times, but competitors like Samsung’s 980 Pro and the much cheaper Adata’s XPG Gammix S50 Lite outpace it here.
Transfer Rates – DiskBench
We use the DiskBench storage benchmarking tool to test file transfer performance with our own custom blocks of data. Our 50GB dataset includes 31,227 files of various types, like pictures, PDFs, and videos. We copy the data set to a new folder and then follow-up with a read test of a newly-written 6.5GB zip file.
The Rocket 4 Plus broke the 1 GBps barrier while copying our 50GB folder of files, but its performance wasn’t up to par with WD’s Black SN850 or Samsung’s 980 Pro. However, the Rocket proves itself when reading back the 6.5GB .zip file with a sequential read performance that tops the chart at 3.4 GBps.
Trace Testing – PCMark 10 Storage Tests
PCMark 10 is a trace-based benchmark that uses a wide-ranging set of real-world traces from popular applications and everyday tasks to measure the performance of storage devices. The quick benchmark is more relatable to those who use their PCs for leisure or basic office work, while the full benchmark relates more to power users.
As we saw with the 1TB model, the Sabrent Rocket 4 Plus is more responsive than PCIe 3.0 competitors when it comes to most ordinary everyday tasks, and even when hammered with heavier workloads like content creation, but still, WD’s Black SN850 and Samsung’s 980 Pro continue to prove more responsive in PCMark 10’s application trace tests.
Synthetic Testing - ATTO / iometer
iometer is an advanced and highly configurable storage benchmarking tool while ATTO is a simple and free application that SSD vendors commonly use to assign sequential performance specifications to their products. Both of these tools give us insight into how the device handles different file sizes.
Sequential speed is the Sabrent Rocket 4 Plus’s strong suit, and its ATTO results show a sizable lead over the competition at most block sizes beyond 256KB a QD1. Peak throughput measured roughly 7.1/6.6 GBps read/write, but peak read throughput required increasing the block size to 1MB, up from the 128KB block size where we typically measure peak throughput. Still, the 2TB's write performance is unmatched.
The Rocket 4 Plus’s random performance at QD1 is very respectable; the device delivered the fastest 4K random write speeds we've seen. When upping the QD, the Sabrent Rocket 4 Plus’s performance peaks at roughly 580,000 random read/write IOPS on our test bench.
Sustained Write Performance and Cache Recovery
Official write specifications are only part of the performance picture. Most SSDs implement a write cache, which is a fast area of (usually) pseudo-SLC programmed flash that absorbs incoming data. Sustained write speeds can suffer tremendously once the workload spills outside of the cache and into the "native" TLC or QLC flash. 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. We also monitor cache recovery via multiple idle rounds.
Data collection with our 2TB drive was hard due to the controller's firmware and thermal throttling algorithms. This test pushes SSDs to the limit as we fill the drive completely with data in one long sustained workload, and we caution that most users won't encounter this type of workload during normal use.
We found ourselves retesting the cache multiple times with varying levels of preconditioning and idle timing to finally attain a result that reflects a large dynamic cache, something we ordinarily don’t have to do. Most runs came up short of what we expected to see. Our logs recorded a small 40GB cache, but relatively fast sustained speeds beyond the cache.
When we got a few runs where the large dynamic SLC cache showed itself, the logs showed thermal throttling at the 300GB point and beyond. That was with a 120mm fan directly over top of the M.2 drive, mind you. To completely prevent thermal throttling from occurring, we threw on the motherboard’s M.2 heatsink and used an additional 120mm fan for good measure.
Finally, after multiple failed attempts, we recorded a decent run. From empty, write speeds averaged 6.8 GBps up until the Rocket 4 Plus wrote roughly 710GB. After that, the write speed degraded to an average speed of 1,135 MBps until full. When it comes to the 2TB model’s recovery, the Rocket 4 Plus recovered at a pace of roughly 50GB-100GB per minute.
Power Consumption and Temperature
We use the Quarch HD Programmable Power Module to gain a deeper understanding of power characteristics. Idle power consumption is an important aspect to consider, especially if you're looking for a laptop upgrade. Some SSDs can consume watts of power at idle while better-suited ones sip just milliwatts. Average workload power consumption and max consumption are two other aspects of power consumption, but performance-per-watt is more important. A drive might consume more power during any given workload, but accomplishing a task faster allows the drive to drop into an idle state more quickly, ultimately saving energy.
We also monitor the drive’s temperature via the S.M.A.R.T. data and an IR thermometer to see when (or if) thermal throttling kicks in and how it impacts performance. Bear in mind that results will vary based on the workload and ambient air temperature.
Sabrent’s Rocket 4 Plus scores well in terms of its efficiency, scoring similarly to the Adata XPG Gammix S50 Lite. But with the second-highest average power consumption and a recording of over 8.5W in peak power draw, the Rocket 4 Plus can get quite thirsty under load.
Idle power consumption is well regulated, and the 2TB model should remain cool when hit with average workloads. However, with more flash, the 2TB model tends to hit its thermal throttle point a little faster than the 1TB model. As such, we recommended using it with a heat sink for full performance, or else that 70-degree Celsius thermal limit could potentially impact performance during heavy sustained workloads.
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