The Connector Formerly Known as SFF-8639 - Now Called U.2

Subject: Storage | June 8, 2015 - 04:04 PM |
Tagged: U.2, ssd, SFF-8639, pcie, NVMe, Intel, computex 2015, computex

Intel has announced that the SSD Form Factor Working Group has finally come up with a name to replace the long winded SFF-8639 label currently applied to 2.5" devices that connect via PCIe.

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As Hardwarezone peeked in the above photo, the SFF-8639 connector will now be called U.2 (spoken 'U dot 2'). This appropriately corresponds with the M.2 connector currently used in portable and small form factor devices today, just with a new letter before the dot.

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An M.2 NVMe PCIe device placed on top of a U.2 NVMe PCIe device.

Just as how the M.2 connector can carry SATA and PCIe signaling, the U.2 connector is an extension of the SATA / SAS standard connectors:

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Not only are there an additional 7 pins between the repurposed SATA data and power pins, there are an additional 40 pins on the back side. These can carry up to PCIe 3.0 x4 to the connected device. Here is what those pins look like on a connector itself:

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Further details about the SFF-8639 / U.2 connector can be seen in the below slide, taken from the P3700 press briefing:

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With throughputs of up to 4 GB/sec and the ability to employ the new low latency NVMe protocol, the U.2 and M.2 standards are expected to quickly overtake the need for SATA Express. An additional look at the U.2 standard (then called SFF-8639), as well as a means of adapting from M.2 to U.2, can be found in our Intel SSD 750 Review.

Source: Hardwarezone
Subject: Storage
Manufacturer: Intel

Introduction, Specifications and Packaging

Editor's note: We are hosting a live stream event with our friends at Intel's SSD group today to discuss the new SSD 750 Series launch and to giveaway a couple of the 400GB units as well! Be sure you stop by to ask quesitons, learn about the technology and have a chance to win some hardware!!

Introduction:

Intel has a habit of overlapping their enterprise and consumer product lines. Their initial X25-M was marketed to both consumer and enterprise, with heavier workloads reserved for the X25-E. Their SSD 320 Series was also spec'd for both consumer and enterprise usage. Their most recent SSD 730 Series was actually an overclocked version of their SSD DC S3500 units. Clearly this is an established trend for Intel, so when they dominated flash memory performance with the SSD DC P3700 launch last year, pretty much everyone following these sorts of things eagerly waited in anticipation of a consumer release.

While they were hard to find outside of enterprise supply chains, some dedicated users picked up that enterprise part for their enthusiast systems, but many were disappointed as the P3700's enterprise hardware and firmware conflicted with many consumer motherboards' BIOS, rendering it unbootable for some and causing address space conflicts for others. In short, the P3700 was a great product that simply did not function properly with most consumer motherboards. All anyone could do was wait for Intel to spin a consumer product from this enterprise part, and that day is today:

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This is the add-in card version of the new Intel SSD 750 Series that brings NVMe technology and insane performance levels to consumers at a cost that is more affordable than you might think.

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As with the enterprise variant, Intel chose to launch the SSD 750 Series in the familiar HHHL PCIe x4 form factor as well as a 2.5" SFF-8639 packaging. The 2.5" model contains the exact same set of components, just rearranged into a smaller device.

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Despite being 2.5", this is not a SATA device. While the connector may look similar, it is *very* different:

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As you can see above, SFF-8639 further extends on the familiar SATA power and data connections, which had already been extended a few times to add additional SAS data lines. The new spec adds a complete row of pins on the back side of the connector to support four lanes of PCIe. This means the SFF variant of the SSD 750 will perform identically to the PCIe half-height card version. Since SFF-8639 was born as an enterprise spec, one question remains - how do you connect it to a consumer desktop motherboard? Well, desktop motherboards are coming with M.2 ports that can support up to PCIe 3.0 x4, so all you really need is a simple way to get from point A to point B:

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Pictured above (left) is the ASUS 'Hyper Kit' adapter PCB, which was sampled to us with their new Sabertooth X99 motherboard just for testing these new 2.5" devices. The connector you see at the right may look familiar, as it is an internal Mini-SAS HD (SFF-8643) cable commonly used with high end SAS RAID cards. Intel is basically borrowing the physical spec, but rewiring those four SAS lanes over to the PCIe pins of the SFF-8639 connector at the other end of the cable.

Continue reading our review of the Intel SSD 750 Series NVMe 1.2TB PCIe drives!!

CES 2015: OCZ shows off new JetExpress SSD controller, Vector 180, Z-Drive 6000

Subject: Storage, Shows and Expos | January 9, 2015 - 02:36 PM |
Tagged: Z-Drive 6000, Vector 180, ssd, SFF-8639, sata, pcie, ocz, NVMe, M.2, JetExpress, CES 2014, CES

At CES, we stopped by OCZ and were briefed on their new SSD controller, the JetExpress:

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As indicated on the placard, the JetExpress supports M.2 PCIe 3.0 x4 (M.2 is typically PCIe 2.0), and natively supports both SATA and PCIe / NVMe connectivity.

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I found out some more goodies about this new controller. Aside from being configurable during production to support SATA or PCIe, this is actually a 10 channel controller (SSDs are typically limited to 8 channels). The controller can support LDPC *in addition to* BCH error correction. This is important as LDPC requires more compute power and is slower than BCH, so OCZ is baking in the capability to use BCH early on, and transition over to LDPC as the flash wears to the point where BCH can no longer efficiently correct bad pages. This means the JetExpress should be able to maintain very high performance while extending flash life out with LDPC only when it's needed.

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Above is the Vector 180, which is launching soon. We are under NDA on this product, but nothing is stopping you from checking out the pic of what they had displayed above :).

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Here's the Z-Drive 6000, an SFF-8639 (PCIe 3.0 x4) 2.5" enterprise SSD. The PMC Sierra controller supports NVMe connectivity and power modes are switchable to enable even higher performance. Performance looks to be very competitive with the Intel P3700, rated at 3GB/sec reads and 2GB/sec writes, as well as 700,000 4k random read and 175,000 4k random write IOPS. Our next OCZ review should be of the Vector 180, but samples are not out yet, so stay tuned!

OCZ's press blast for the JetExpress launch appears after the break.

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Source: OCZ