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Intel NVMe SSD

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Intel NVMe SSD

Intel NVMe SSD

SSD drives continue to evolve and the latest advancement comes with the release of Intel’s NVMe (Non-Volatile Memory Express) SSD drives. NVMe is a specification that was designed specifically for flash memory communication and allows solid state drives to connect to the system using the PCIe bus giving these types of Solid State drives the ability to reach their true throughput potential. In addition to being extremely durable, the benefits of NVMe with PCIe over traditional SATA SSD drives are reduced latency, increased IOPS, and even lower power consumption.

As is the case with previous generations, not all SSDs are created equally. Intel NVMe SSD drives use their own engineered and manufactured 18 channel controller which offers improved internal bandwidth as well as reduced internal latencies. Intel will offer two form factors beginning with the AIC form factor which is a PCIe expansion card design. This series is a half height half length card that plugs directly into a PCIe 3.0 x4 slot and is ideal for use in low profile servers. The second form factor is a 2.5” 15mm disk drive style that incorporates a SFF-8639 compatible connector allowing you to connect the drive using standard or hot swap drive enclosures.

Within the two NVMe families, Intel offers four series of drives which are differentiated by write performance as well as endurance and range in storage capacity from 400GB to 2TB. The P3700 is the highest performance and highest endurance drive for enterprise use, the P3600 is an excellent mid-range solution while the P3500 fits nicely in the entry level enterprise or enthusiast’s market segment. In addition, Intel has released the Intel 750 series which is targeting the client market so for users that do not run enterprise applications, Intel engineered the firmware to be more suitable for client applications making it an excellent choice for enthusiasts.

Product P3700 P3600 P3500 750
Sequential Red (MB/s) 2800 2600 2500 2200
Sequential Writes (MB/s) 1900 1700 1700 900
4KB Random Read (IOPS) 460,000 450,000 450,000 430,000
4KB Random Write (IOPS) 180,000 70,000 35,000 22,000
Write Endurance (DWPD) 10 3 .3 .3
Performance
SSD drives deliver many benefits for both enterprise and client users including high performance, extreme durability, and low power consumption. No matter the interface, SSD drives still maintain these inherent characteristics but with NVMe SSD drives users get the benefits of even higher performance mainly measured in IOPS (Input/Output).

As previously mentioned, the Intel NVMe family of drives use the PCIe 3.0 x4 slot which delivers up to 4GB/s of throughput compared to SATA 3 which supports up to 600MB/s data transfer rates but this is not the only limiting legacy technology for traditional SSD drives. In addition traditional SATA 3 SSD drives utilize the AHCI interface. This communication protocol was designed for high latency mechanical disks and actually resulted in high CPU usage when coupled with low latency SSD drives.

NVMe AHCI
Latency 2.8us 6us
Maximum Que Depth Up to 64K queues with
64K commands each
Up to 1 queue with
32 commands each
Multicore Support Yes Limited
4KB Efficiency One 64B fetch Two serialized host DRAM fetches required

Removing the bandwidth limitations of SATA and shedding the AHCI communication protocol with technologies such as NVMe and PCIe that were specifically designed for SSD devices results in dramatically improved performance. When measuring IOPS, Intel NVMe drives are capable of up to 450,000 IOPS compared to the best performing SATA drives which could potentially achieve up to 100,000 IOPS. This not only results in higher performance but also better CPU utilization particularly in applications that have multiple processors.

Protocol Intel NVMe SAS HDD SATA SSD
Random 4K Read/Write (IOPS) Up to 450,000 Up to 190,000 Up to 100,000
Sequential R/W Performance (MB/s) Up to 2,800 Up to 1,000 Up to 550
Form Factor 2.5”, HHHL AIC 2.5” 2.5”
Interface PCIe 3.0 SAS 12 GB/s SATA 6GB/s

 

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