The Samsung 960 EVO (1TB) Review
by Billy Tallis on November 15, 2016 10:00 AM ESTPerformance Consistency
Our performance consistency test explores the extent to which a drive can reliably sustain performance during a long-duration random write test. Specifications for consumer drives typically list peak performance numbers only attainable in ideal conditions. The performance in a worst-case scenario can be drastically different as over the course of a long test drives can run out of spare area, have to start performing garbage collection, and sometimes even reach power or thermal limits.
In addition to an overall decline in performance, a long test can show patterns in how performance varies on shorter timescales. Some drives will exhibit very little variance in performance from second to second, while others will show massive drops in performance during each garbage collection cycle but otherwise maintain good performance, and others show constantly wide variance. If a drive periodically slows to hard drive levels of performance, it may feel slow to use even if its overall average performance is very high.
To maximally stress the drive's controller and force it to perform garbage collection and wear leveling, this test conducts 4kB random writes with a queue depth of 32. The drive is filled before the start of the test, and the test duration is one hour. Any spare area will be exhausted early in the test and by the end of the hour even the largest drives with the most overprovisioning will have reached a steady state. We use the last 400 seconds of the test to score the drive both on steady-state average writes per second and on its performance divided by the standard deviation.
The 960 EVO's steady state random write speed is not quite as fast as the 960 Pro, but it's in the same league and much faster than most consumer SSDs.
The 960 EVO sets a new record for combining high performance with consistency. It's a bit slower than the 960 Pro, but less variable.
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Highly consistent performance is a good thing, but it makes for a boring graph. The transitions from peak to sustained performance modes look the same for both the 960 Pro and the 960 EVO.
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The 960 EVO responds to extra overprovisioning with even more consistent (and high) performance.
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TheinsanegamerN - Tuesday, November 15, 2016 - link
Is there currently any consumer software that can change these settings?Billy Tallis - Tuesday, November 15, 2016 - link
I use nvme-cli on Linux to manually test these settings, and there's a patch working its way toward a stable kernel release that will let supporting drives automatically make use of their various idle states. I'm not aware of any Windows tools that give the same degree of fine-grained control, but Intel's tools for enterprise SSDs and the 750 have some power management options.TheinsanegamerN - Tuesday, November 15, 2016 - link
That would be nice. I'd love to be able to set my 950 pro to a max of, say 2 watt on battery, or set the maximum speed to sata III speed (on battery), if it meant better battery life, and enable full speed when on mains power.philehidiot - Tuesday, November 15, 2016 - link
Yeh I noted the thermal limits kicking in and I did wonder if there's any major benefit from hacking these things, putting on some thermal goop, a big heat sink and a fan. Obviously it'll probably not help in the majority of cases but the mentalist part of me was pondering just how much performance there is to be unlocked.TheinsanegamerN - Tuesday, November 15, 2016 - link
The fan would be a bit of overkill, but the 950 pro showed some gains with a passive heatsink installed. The 960 would probably benefit even more.philehidiot - Tuesday, November 22, 2016 - link
Time to break out the liquid nitrogen. If anyone at work asks where it has all gone I'll just say I was remove the mother of all warts from a patient.philehidiot - Tuesday, November 22, 2016 - link
*removing. Bloody spelling.nagi603 - Tuesday, November 15, 2016 - link
A shame they dropped the write endurance to half of the 950!TheinsanegamerN - Tuesday, November 15, 2016 - link
TLC vs MLCbull2760 - Tuesday, November 15, 2016 - link
Why do you not show consistent results. In some tests you include the Intel 750 and on other you exclude it in the graph. You excluded the Intel 750 in the power consumption both times. Are you not able to calculate the power being used when the Intel drive is being used?