Benefits of SATA 3?

Question

Hello,
I'm wondering about the usefulness of SATA 3, which has a transfer rate of 6 Gb/s, while the best SSDs claim "only" 300 Mo/s?
Is there a trick or are we preparing SSDs with much higher speeds?
In a word, should we wait to invest in a motherboard equipped with SATA 3 at a reasonable price?
Thank you in advance for your insights.

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borisdu · Accepted Answer

Read,

A little clarification before we begin. SATA 3 indeed has a theoretical transfer speed of 6Gb/s (six gigabits per second) and the SSD 300 Mo/s (three hundred megabytes per second).

One byte consists of 8 bits. A gigabit represents 2^30 bits and a megabit represents 2^20 bits,

Basically, 1Gb = 1024Mb
and 1Go = 1024Mo

The speed of SATA 3 is 6Gb/sec = 6*1024 Mb/sec = (6*1024)/8 = 768 Mo/sec in theoretical speed.

There you go, you have your answer.

Another clarification, the lines of SATA 3 and USB3 are wired on PCI Express lines. Basically, unless you have a 1366 platform, all SATA3 disks are wired on the same line.

This means that if you connect three SSDs on SATA 3, you will exceed the bandwidth of your SATA3. Well, I admit that this isn't within everyone's reach, but given the evolution of SSD prices, in the near future (when SSDs will support RAID 0) we will reach speeds saturating SATA 3.

Scarface72 · Answer

Hello

SATA 3 (6.0GB/s) currently has limited interest, that’s for sure.

Traditional spinning hard drives at 7200 or even 10000 RPM do not even reach the speeds allowed by SATA 2 (3.0Gb/s), so it certainly isn't for this type of storage that SATA 3 brings anything.

As for the most efficient SSDs, the only ones currently available on SATA 3 are the Crucial RealSSD, with a read speed of up to 355Mo/s.

As borisdu said, SATA 3 is 6.0 Gigabits per second, so dividing by 8 for simplicity gives us 750 Megabytes per second.
SATA 2 is around +/- 375Mo/s...

Therefore, there is currently no storage system that utilizes the capabilities of SATA 3.

And finally, for the hard drive manufacturers that have the audacity to say, "SATA 3, a revolution in the world of storage" when they are barely able to make 7200 RPM hard drives that achieve speeds equivalent to a third (+/- 120Mo/s) of the maximum allowed by the SATA 2 standard, it’s quickly understood that this is yet again a baseless marketing argument.

We will have to wait for SSDs to be even more efficient and also cheaper.
--
Before asking a question: 1° Turn on your brain; your PC doesn’t think for you!
2° Google is your friend, as is the search engine on CCM, so do some research!

Rob In The Hood · Answer

and what is the controller in this case? (I'm talking about the one embedded on the SSD...?)

and since the Sata 3 are connected to the PCI-e, according to what Boris says, what does that change in the end?

PS: after some research, I found this quickly, I don't know if it's the same for the model you're talking about:

http://www.01net.com/fiche-produit/avis-redac-8448/disques-durs-ocz-technology-revodrive

This SSD consists of 120 or 240 GB of MLC flash memory, connected to two SandForce-1200 controllers arranged in Raid-0 directly on the card. This Raid-0 is managed by a Sata controller also integrated into the SSD. The advantage is simple: the two SandForce controllers, already very efficient, offer advertised speeds of 540 MB/s in read and 480 MB/s in write, which is excellent. This SSD is also claimed to be bootable on all motherboards capable of booting from storage in Raid.

the notion of Sata is therefore still present, if your disk is based on the same architecture

and apparently the performance gain would mainly come from the RAID 0 setup, if I understand correctly...

however, we see that this model also has disadvantages... but as said, we need to see if yours is of the same kind, or if it's different...

borisdu · Answer

I think you are mixing things up. In modern processors (i3-5-7 and Phenom II), the PCIe controller is integrated into the processor. However, the SATA 6Gb/s standard has a bandwidth that only PCIe lanes can support. Therefore, motherboard manufacturers reallocate one PCI lane for the SATA 3 controller (which is integrated into the motherboard).

In a processor, the number of PCI lanes is limited by the processor itself. This is why, in particular, it is impossible to run SLI or Crossfire in PCIe 16x-16x (16 PCI lanes per connector) on a 1156 socket.

The SATA 3 controller occupies one of the PCI lanes designated for the PCIe connector.

Soscal · Answer

Thank you borisdu
I had indeed done the same calculation as you and came up with 768 MB/s for SATA3 and 384 MB/s for SATA2, which seemed sufficient to power an SSD. However, I thought that each line was independent and offered the same throughput. So, indeed, in the case of multiple drives, it makes sense to go with SATA3.
Thanks again.

Benefits of SATA 3?

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