OCZ RevoDrive 350 – PCIe SSD – First Look

vbimport

#1

We’ve just posted the following review: OCZ RevoDrive 350 – PCIe SSD – First Look[newsimage]http://static.myce.com//images_posts/2014/04/drive-tiny.png[/newsimage]

There are times when SATA just isn’t fast enough to meet the demands of high end workstation workloads.

Enter the OCZ Storage Solutions RevoDrive 350. The RevoDrive 350 completes the OCZ transition to Toshiba NAND. It doesn’t stop there though.
The RevoDrive 350 also makes the transition to a PCIe generation 2 x8 connection to the PCIe system bus. Thereby increasing the total bandwidth to approximately 4GB/s

How does it perform?
Let’s find out in this article.

            Read the full article here: [http://www.myce.com/review/ocz-revodrive-350-pcie-ssd-first-look-71305](http://www.myce.com/review/ocz-revodrive-350-pcie-ssd-first-look-71305)

            Please note that the reactions from the complete site will be synched below.

#2

Negative:

  • Nothing to mention at the moment.
    How about the fact that 4k random reads at Queue Depth 1 is worse than most ordinary SSD drives and half the performance of the best drives?
    I would think that would be a negative?!


#3

[QUOTE=DrageMester;2726037]I would think that would be a negative?![/QUOTE]Not on a workstation class drive. Workstation class drives are tuned for high queue depth mixed read/write workloads.

The RevoDrive 350 is basically 4 SSDs in RAID 0, and it isn’t possible to scale such a small file across the 4 SSD controllers at queue depth 1. There is a also a RAID controller on-board which adds a little latency.

Try RAIDing a couple of SDDs yourself, and run the same test. You’ll find that 4K QD1 can’t scale across both SSDs in the RAID array.


#4

Z97 Wendy, SATA Express and you have the SSD now, I cant wait.:slight_smile:


#5

There seems to be some confusion between PCIe and SATA Express. They are both quite different.

[B]PCIe[/B] (PCI Express). Every modern PC has PCIe. It’s a high speed connection for connecting things like a graphics card, and can use up to 16 PCIe generation 3 lanes to get the required performance. To get an SSD to work on this system bus requires a Non-Volatile-Memory (NVM) controller to communicate between the NAND flash layer and the PCIe system bus, and drivers to make it all work.

The RevoDrive 350 uses a proprietary NVM layer called VCA2, and connects to PCIe using 8 PCIe gen 2 lanes, so the max available bandwidth available is 4GB/s.

The NVMe specification should soon make an appearance in SSDs, where all SSD that comply with the specifications should work with a single unified driver. NVMe doesn’t use AHCI, so should be far more efficient than SATA Express.

[B]SATA Express[/B], is SATA over PCIe. It still uses the AHCI layer, and at the moment appears to be limited to 2 PCIe Gen 2 lanes, so has a max bandwidth of 1GB/s without overheads. With overheads you can expect around 800MB/s max.

On Intel’s soon to be released Z97 chipset, they appear to have combined two SATA 6Gbps ports and added a (keying) connection to achieve SATA Express. This is at the expense (when SATA Express is used) of sacrificing 2 SATA 6Gbps ports.

If SATA Express is not used, then you can use these ports (minus the keying port) to bring the count back up to 6x SATA 6Gbps ports.