Sequential Read Performance

Our first test of sequential read performance uses short bursts of 128MB, issued as 128kB operations with no queuing. The test averages performance across eight bursts for a total of 1GB of data transferred from a drive containing 16GB of data. Between each burst the drive is given enough idle time to keep the overall duty cycle at 20%.

Burst 128kB Sequential Read (Queue Depth 1)

The QD1 burst sequential read performance of the Intel Optane SSD 800p is close to their rated maximum throughput, but they are far behind the 900p and high-end Samsung drives that actually need more than two PCIe lanes.

Our test of sustained sequential reads uses queue depths from 1 to 32, with the performance and power scores computed as the average of QD1, QD2 and QD4. Each queue depth is tested for up to one minute or 32GB transferred, from a drive containing 64GB of data.

Sustained 128kB Sequential Read

On the longer sequential read test, the Samsung NVMe SSDs fall down to the level of the Optane SSD 800p, because the flash-based SSDs are slowed down by some of the data fragmentation left over from the random write test. The Optane SSDs performed those writes as in-place modifications and thus didn't incur any fragmentation. This leaves the Samsung 960 PRO 2TB barely faster than the 800p, while the 900p runs away with its lead.

Sustained 128kB Sequential Read (Power Efficiency)

The Optane SSD 800p has the clear lead in power efficiency, as its second-tier performance comes with far lower power consumption than the top-performing 900p.

There are no big surprises with the queue depth scaling; the 800p's sequential reads are slightly faster at QD2 than QD1, but there's no further improvement beyond that. The 800p is easily staying within its 3.75 W rated maximum power draw.

Sequential Write Performance

Our test of sequential write burst performance is structured identically to the sequential read burst performance test save for the direction of the data transfer. Each burst writes 128MB as 128kB operations issued at QD1, for a total of 1GB of data written to a drive containing 16GB of data.

Burst 128kB Sequential Write (Queue Depth 1)

The burst sequential write speed of the Intel Optane SSD 800p is no better than the low-end flash-based NVMe SSDs. Without any write caching mechanism in the controller, the fundamental nature of 3D XPoint write speeds shows through. The 900p overcomes this by using a 7-channel controller, but that design doesn't fit within the M.2 form factor.

Our test of sustained sequential writes is structured identically to our sustained sequential read test, save for the direction of the data transfers. Queue depths range from 1 to 32 and each queue depth is tested for up to one minute or 32GB, followed by up to one minute of idle time for the drive to cool off and perform garbage collection. The test is confined to a 64GB span of the drive.

Sustained 128kB Sequential Write

The Optane SSD 800p looks better on the sustained sequential write test, as all the TLC-based SSDs run out of SLC cache and slow down dramatically, while the Optane SSDs keep delivering the exact same performance.

Sustained 128kB Sequential Write (Power Efficiency)

Despite their very different sequential write throughput, the Optane SSD 900p and 800p end up with very similar power efficiency on this test. The Samsung NVMe drives are even more efficient, but only the premium MLC-based 960 PRO has a large lead.

Almost all of the drives show no performance scaling with increasing queue depth, as large-block sequential writes can keep all the memory channels busy with only a little bit of buffering. The 900p needs at least two 128kB writes in flight to reach full throughput.

Random Performance Mixed Read/Write Performance


View All Comments

  • AnnonymousCoward - Wednesday, March 14, 2018 - link

    No. My understanding is that most load times are CPU bound, and there's a negligible difference from most 500MB/s SATA III drives vs the Samsung 950/960 vs Optane. That makes it completely pointless for almost all users. Reply
  • emvonline - Friday, March 16, 2018 - link

    so any reasonable calculation says chip can be cycled 7-10k times (mlc nand is specd at 10k). And total tbw is less than most of the competion 960 pro ssds. is this true? so its around enterprise mlc in endurance??? Reply
  • mkozakewich - Sunday, March 18, 2018 - link

    Why is everyone so bad at figuring out when to use things? This would be great in any environment where you're prioritizing low-queue-depth transfers. Obviously it's not going to replace your computer's SSD. Reply
  • MDD1963 - Friday, March 23, 2018 - link

    When these things cost less than and/or exceed the performance of the 960 EVO, perhaps then they will begin to sell.... Reply
  • DocNo - Thursday, April 12, 2018 - link

    Use this as L2 cache with PrimoCache and prepared to be amazed. I have the 64GB Optane paired with Primocache and the performance difference is notable - even with my primary drive being a Samsung M2 Pro series SSD drive. If I wasn't so happy with my current setup I'd be all over this new drive as an L2 cache. And unlike Intel's caching software for Optane, Primocache is trivial to install with no special requirements for BIOS or partitioning.

    Primocache is also the most inexpensive way I have found to accelerate Windows server too. I'm a huge fan!
  • Chongsboy - Monday, August 27, 2018 - link

    Not sure where you guys work, or what you have against optane is, but under server conditions, a new mb design, would be wonderful for servers, ie: cloud servers. Where workers are a fricken arm and a leg, hardware costs is not that much of an issue, especially special discounts intel will give to big players. I feel that most ppl here commenting negatively dont actually run real life servers, dealing with thousands, maybe not even hundred requests per minute. Reliability amd speed trumps prices for these servers as if you dont realize aws and all cloud providers are ripping people off, and thats why these c rooked companies are earning billions. Anyways, i deal with these cloud systems in my work. I for one expect all large companies to mov to optane, because it's just that fast, and reliable: ie facebook, aws, azure, what not. Dunno why people are going nuts... we got intel haters galore here... Reply

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