Intel SSD 750 PCIe SSD Review: NVMe for the Clientby Kristian Vättö on April 2, 2015 12:00 PM EST
I don't think it's an overstatement to say that Intel introduced us to the era of modern SSDs back in 2008 with the X25-M. It wasn't the first SSD on the market, but it was the first drive that delivered the aspects we now take for granted: high, consistent and reliable performance. Many SSDs in the early days focused solely on sequential performance as that was a common performance metric for hard drives, but Intel understood that the key to better user performance wasn't the maximum throughput, but the small random IOs that take unbearably long to complete on HDDs. Thanks to Intel's early understanding of real world workloads and implementing the knowledge to a well designed product, it took several years before others were able to fully catch up with the X25-M.
But when the time came to upgrade to SATA 6Gbps, Intel missed the train. The initial SATA 6Gbps drives had to rely on third party silicon because Intel's own SATA 6Gbps controller was still in development, and to put it frankly the SSD 510 and SSD 520 just didn't pack the same punch as the X25-M did. The others had also done their homework and gone back to drawing board, which meant that Intel was no longer in the special position it was in 2008. Once the SSD DC S3700 with in-house Intel SATA 6Gbps controller finally materialized in late 2012, it quickly built back the Intel image that the company had in the X25-M days. The DC S3700 wasn't as revolutionary as the X25-M was, but it again focused on areas where other manufacturers had been lacking, namely performance consistency.
The first and second generation Intel X25-M
While Intel was arguably late to the SATA 6Gbps game, the company already had something much bigger in its mind. Something that would abandon the bottlenecks of SATA interface and challenge the X25-M in significance in the history of SSDs. That product was the SSD DC P3700, the world's first drive with custom PCIe NVMe controller and the first NVMe drive that was widely available.
Ever since our SSD DC P3700 review, there's been massive interest from enthusiasts and professionals for a more client-oriented product based on the same platform. With eMLC, ten drive writes per day endurance and a full enterprise-class feature set, the SSD DC P3700 was simply out of reach for consumers at $3 per gigabyte because the smallest 400GB SKU cost the same as a decent high power PC build. Intel didn't ignore your prayers and wishes and with today's release of the SSD 750 Intel is delivering what many of you have been craving for months: NVMe with a consumer friendly price tag in a 2.5" form factor via SFF-8639 or a PCIe add-in card.
|Intel SSD 750 Specifications|
|Form Factor||2.5" 15mm SFF-8639 or PCIe Add-In Card (HHHL)|
|Interface||PCIe 3.0 x4 - NVMe|
|NAND||Intel 20nm 128Gbit MLC|
|4KB Random Read||430K IOPS||440K IOPS|
|4KB Random Write||230K IOPS||290K IOPS|
|Idle Power Consumption||4W||4W|
|Read/Write Power Consumption||9W / 12W||10W / 22W|
|Endurance||70GB Writes per Day for Five Years|
Even though the SSD 750 is built upon the SSD DC P3700 platform, it's a completely different product. Intel spent a lot of time on redesigning the firmware to be more suitable for client applications, which differ greatly from typical enterprise workloads. The SSD 750 is supposed to be more focused on random performance as the majority of IOs in client workloads tend to have random patterns and be small in size. The sequential write speeds may seem a bit low for such high capacities for that reason, but ultimately Intel's goal was to provide better real world performance rather than focus on maximum benchmark numbers, which has been Intel's strategy ever since the X25-M days.
At the time of launch, the SSD 750 will only be available in capacities of 400GB and 1.2TB. An 800GB SKU is being considered, but I think Intel is still testing the waters with the SSD 750 and thus the initial lineup is limited to just two SKUs. After all, the ultra high-end is a niche market and even in that space the SSD 750 is much more expensive that existing SATA drives, so a gradual roll out makes a lot of sense. I think for enthusiasts the 400GB model is the sweet spot because it provides enough capacity for the OS and applications/games, whereas professionals will likely want to spring for the 1.2TB if they are looking for high-speed storage for work files (video editing is a prime example).
The SSD 750 utilizes Intel-Micron's 20nm 128Gbit MLC NAND. The die configuration is actually fairly interesting because the packages on the front-side on the PCB (i.e. the one that's covered by the heat sink and where the controller is) are quad-die with 64GiB capacity (4x128Gbit), whereas the packages on the back-side of the PCB are all single-die. I suspect Intel did this for heat reasons because PCIe is more capable of utilizing NAND to its full potential, which increases the heat output and obviously four dies inside one package generate more heat than a single die. With 18 packages on the front-side and 14 on the backside, the raw NAND capacity comes in at 1,376GiB, resulting in effective over-provisioning of 18.8% with 1,200GB of usable capacity.
The controller is the same 18-channel behemoth running at 400MHz that is found inside the SSD DC P3700. Nearly all client-grade controllers today are 8-channel designs, so with over twice the number of channels Intel has a clear NAND bandwidth advantage over the more client-oriented designs. That said, the controller is also much more power hungry and the 1.2TB SSD 750 consumes over 20W under load, so you won't be seeing an M.2 variant with this controller.
Similar to the SSD DC P3700, the SSD 750 features full power loss protection that protects all data in the DRAM, including user data in flight. I'm happy to see that Intel understands how power loss protection can be a critical feature for the high-end client segment as well because especially professional users can't have the risk of losing any data.
The Form Factors & SFF-8639 Connector
The SSD 750 is available in two form factors: a traditional half-height, half-length add-in card and 2.5" 15mm drive. The 2.5" form factor utilizes an SFF-8639 connector that is mostly used in the enterprise, but it's slowly making its way to the high-end client side as well (ASUS just announced TUF Sabertooth X99 two weeks ago at CeBit). The SFF-8639 is essentially SATA Express on steroids and offers four lanes of PCIe connectivity for up to 4GB/s of bandwidth with PCIe 3.0 (although in real world the maximum bandwidth is about 3.2GB/s due to PCIe inefficiency). Honestly, aside from the awkward name, SFF-8639 is what SATA Express should have been from the beginning because nearly all upcoming PCIe controller designs will feature four PCIe lanes, which renders SATA Express useless as there's no point in handicapping a drive with an interface that's only capable of providing half of the available bandwidth. That said, I wasn't at the table when SATA-IO made the decision, but it's clear that the spec wasn't fully thought through.
The SFF-8639 connector
Similar to SATA Express, SFF-8639 has a separate SATA power input in the cable. That's admittedly quite unwieldy, but it's necessary to keep the motherboard and cable costs reasonable. The SSD 750 requires both 3.3V and 12V rails for power, so if the drive was to draw power from PCIe it would have required some additional components on the motherboard side, which is something that the motherboard OEMs are hesitant about due to the added cost, especially since it's just one port that may not even be used by the end-user.
The motherboard end of the SFF-8639 cable
As the industry moves forward and PCIe becomes more common, I think we'll see SFF-8639 being adopted more widely. The 2.5" form factor is really the best for a desktop system because the drive location is not fixed to one spot on the motherboard or in the case. While M.2 and add-in cards provide a cleaner look thanks to the lack of cables, they both eat precious motherboard area that could be used for something else. That's the reason why motherboards don't usually have more than one M.2 slot as the area taken by the slot can't really be used for any other components. Another issue especially with add-in cards is the heat coming from other PCIe cards (namely high power GPUs) that can potentially throttle the drive, whereas drive bays tend to be located in the front of the case with good airflow and no heat coming from surrounding components.
Utilizing the Full Potential of NVMe
Because the SSD 750 is a PCIe 3.0 design, it must be connected directly to the CPU's PCIe 3.0 lanes for maximum throughout. All the chipsets in Intel's current line up are of the slower PCIe 2.0 flavor, which would effectively cut the maximum throughput to half of what the SSD 750 is capable of. The even bigger issue is that the DMI 2.0 interface that connects the platform controller hub (PCH) to the CPU is only four lanes wide (i.e. up to 2GB/s), so if you connect the SSD 750 to the PCH's PCIe lanes and access other devices connected to the PCB (e.g. USB, SATA or LAN) at the same time the performance would be even further handicapped.
Intel Z97 chipset block diagram
Utilizing the CPU's PCIe lanes presents some possible bottlenecks for the users of Z97 chipset because the normal Haswell CPUs feature only sixteen PCIe 3.0 lanes. In other words, if you wish to use the SSD 750 with a Z97 chipset you have to give up some GPU PCIe bandwidth because the SSD 750 will take four lanes out of the sixteen. With a single GPU setup that's hardly an issue, but with SLI/CrossFire setup there's a possibility of some bandwidth handicapping if the GPUs and SSD are utilizing the interface simultaneously. Also, with NVIDIA's PCIe x8 requirement, it limits itself to a single NVIDIA card implementation. Fortunately it's quite rare that an application would tax the GPUs and storage at the same time since games tend to load data to RAM for faster access and especially with the help of PCIe switches it's possible to grant all devices the lanes they require (although the maximum bandwidth isn't increased, but switches allow full x16 bandwidth to the GPUs when they need it).
Intel X99 chipset block diagram
With Haswell-E and its 40 PCIe 3.0 lanes, there are obviously no issues with bandwidth even with an SLI/CrossFire setup and two SSD 750s. Unfortunately the X99 (or any other chipset) doesn't support PCIe RAID, so if you were to put two SSD 750s in RAID 0 the only option would be to use software RAID. That in turn will render the volume unbootable and I had some performance issues with two Samsung XP941s in software RAID, so at this point I would advice against RAIDing the SSD 750s. We'll have to wait for Intel's next generation chipsets to get proper RAID support for PCIe SSDs.
As for older chipsets, Intel isn't guaranteeing compatibility with 8-series chipsets and older. The main issue here is that the motherboard OEMs aren't usually willing to support older chipsets in the form of BIOS updates and the SSD 750 (and NVMe in general) requires some BIOS modifications in order to be bootable. That said, some older motherboards may work with the SSD 750 just fine, but I suggest you do some research online or contact the motherboard manufacturer before pulling the trigger on the SSD 750.
Understandably the big question many of you have is whether the SSD 750 can be used as a boot drive. I've confirmed that the drive is bootable in my testbed with ASUS Z97 Deluxe motherboard with the latest BIOS and it should be bootable on any motherboard with proper NVMe support. Intel will have a list of supported motherboards on the SSD 750 product page, which are all X99 and Z97 based at the moment but the support will likely expand over time (it's up to the motherboard manufacturers to release a BIOS version with NVMe support).
Furthermore, I know many of you want to see some actual real world tests that compare NVMe to SATA drives and I'm working on a basic test suite to cover that. Unfortunately, I didn't have the time to include it in this review due to this and last weeks' NDAs, but I will publish it as a separate article as soon as it's done. If there are any specific tests that you would like to see, feel free to make suggestions in the comments below and I'll see what I can do.
|AnandTech 2015 SSD Test System|
|CPU||Intel Core i7-4770K running at 3.5GHz (Turbo & EIST enabled, C-states disabled)|
|Motherboard||ASUS Z97 Deluxe (BIOS 2205)|
|Chipset Drivers||Intel 10.0.24+ Intel RST 18.104.22.1680|
|Memory||Corsair Vengeance DDR3-1866 2x8GB (9-10-9-27 2T)|
|Graphics||Intel HD Graphics 4600|
|Desktop Resolution||1920 x 1080|
|OS||Windows 8.1 x64|
- Thanks to Intel for the Core i7-4770K CPU
- Thanks to ASUS for the Z97 Deluxe motherboard
- Thanks to Corsair for the Vengeance 16GB DDR3-1866 DRAM kit, RM750 power supply, Hydro H60 CPU cooler and Carbide 330R case
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magreen - Thursday, April 2, 2015 - linkdarkgreen, are you talking about a G1 without TRIM or a G2 with TRIM support?
darkgreen - Friday, April 3, 2015 - linkI had a G1 without TRIM. The Intel fix was based on some ancient shareware (FreeDOS!) that wouldn't work with many modern motherboards and in some cases left drives bricked. It was well reported at the time (see my comment above for a google search that returns articles), but lots of people wound up with X25-Ms that were useless. If you weren't an enterprise customer the Intel response was "tough luck." No refunds, no replacements, nothing. In all fairness I'm sure Intel would love to be able to support consumers, but they probably aren't set up for it in their storage area because it's just not a big area of their business bottom line.
magreen - Sunday, April 5, 2015 - linkYeah, it seems like the G1 owners got screwed. (I have a G2 and G3 and they've both been great. Sorry they screwed the early adopters.)
In Anand's words from 2009 when the G2 was released:
"TRIM isn’t yet supported, but the 34nm drives will get a firmware update when Windows 7 launches enabling TRIM. XP and Vista users will get a performance enhancing utility (read: manual TRIM utility). It seems that 50nm users are SOL with regards to TRIM support. Bad form Intel, very bad form."
"Overall the G2 is the better drive but it's support for TRIM that will ultimately ensure that. The G1 will degrade in performance over time, the G2 will only lose performance as you fill it with real data. I wonder what else Intel has decided to add to the new firmware...
I hate to say it but this is another example of Intel only delivering what it needs to in order to succeed. There's nothing that keeps the G1 from also having TRIM other than Intel being unwilling to invest the development time to make it happen. I'd be willing to assume that Intel already has TRIM working on the G1 internally and it simply chose not to validate the firmware for public release (an admittedly long process). But from Intel's perspective, why bother?
Even the G1, in its used state, is faster than the fastest Indilinx drive. In 4KB random writes the G1 is even faster than an SLC Indilinx drive. Intel doesn't need to touch the G1, the only thing faster than it is the G2. Still, I do wish that Intel would be generous to its loyal customers that shelled out $600 for the first X25-M. It just seems like the right thing to do. Sigh."
Redstorm - Thursday, April 2, 2015 - linkCould you elaborate on this (although there appears to be an NVMe version too after all) of the SM951. As looking at the numbers if NVMe even slightly improves the SM951 it would make it a better choice, and the form factor being M.2 makes it much more attractive.
Kristian Vättö - Thursday, April 2, 2015 - linkGanesh received an NVMe version of the SM951 inside a NUC and I've also heard from other sources that it exists. No idea of its retail availability, though, as RamCity hadn't heard about it until I told them.
eddieobscurant - Thursday, April 2, 2015 - linkif i'm not wrong the nvme version has p/n MZVPV256HDGL-00000 for the 256gb model while the ahci version has p/n MZHPV256HDGL-00000
Redstorm - Friday, April 3, 2015 - linkThanks looks promising , found this with verbage suposidly from RAMCity that they will ship in May.
Redstorm - Friday, April 3, 2015 - linkSo no real proof that they exist then.
eddieobscurant - Thursday, April 2, 2015 - linkKristian, there is a DRAM difference between the two models. The 400gb has 1gb DRAM while the 1.2tb model has 2gb. Do you think it plays a big role in terms of performance between the two models.
Also is there a way to reduce the overprovision in these drives? I would prefer 80gb more on the 400gb model over less consistency.
When will you review the kingston hyperX predator, and when will samsung release the sm951 nvme? Q3 or sooner?
KAlmquist - Thursday, April 2, 2015 - linkThe 400gb model shouldn't need as much DRAM because it has fewer pages to keep track of. But there's no way to know how the 400gb model will perform until Intel sends out samples for review.