Should I plug my SSD into a SATA 3G or 6G?

Hello folks,

I've got a motherboard that has a couple SATA 6Gb/s connectors (as well as half a dozen SATA 3Gb/s). I have an SSD (this one) that says it's SATA II, which I take to mean for use with 3Gb/s connectors. I've heard that the speeds of many SSDs are "saturating" the throughput of SATA II. What I am wondering is, if I plugged it into a SATA 6Gb instead, would I see higher read/write speeds? Or does the performance of a SATA II SSD not ever exceed the limitations of SATA 3Gb/s?

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  1. Best answer
    Current SSDs aren't quite up to the 3Gbit/sec SATA rate yet, and if the drive itself uses a SATA Version 2.0 chipset then plugging it into a 6Gbit/sec SATA Version 3.0 port won't give you any better performance.

    So the long and short of it is that it's going to perform exactly the same no matter which port you plug it into.
  2. Quote:
    Current SSDs aren't quite up to the 3Gbit/sec SATA rate yet,

    Crucial RealSSD

    - Sequential READ: up to 355 MB/s (SATA 6 Gb/s), up to 265 MB/s (SATA 3 Gb/s)
    - Sequential WRITE: up to 215 MB/s (140 MB/s for 128GB drive)

    almost 100MB/sec faster on 3.0

    seems the reduced latencies of the communications helps

    - READ latency: 55μs (TYP SATA 6 Gb/s), 70μs (TYP SATA 3 Gb/s)
    - WRITE latency: 60μs (TYP SATA 6 Gb/s), 95μs (TYP SATA 3 Gb/s)

    There's an SSD hd that you can buy that plugs into your PCIe because it does 1400MB/sec writes and 1500MB/sec reads with 20k IO/sec

    yes.. about 1.5gigaBYTES/sec both ways.

    The bad part is you can't boot from these because no SATA/SAS since it uses your PCIe. /sigh

    wish I had a few extra $$$ in my pocket.
  3. Thanks for the reply, sminlal! I'm building up my new machine today. I'm gonna use a SATA II connector for my SSD.
  4. Kewlx25 said:

    Interesting - thanks for bringing it to my attention.

    I'll obviously have to qualify my statements more carefully from now on!
  5. Best answer selected by binceng.
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