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

  • Hard Drives
  • SATA
  • Motherboards
  • SSD
  • Storage
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Last response: in Storage
March 24, 2010 11:49:21 PM

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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a b V Motherboard
a c 415 G Storage
March 25, 2010 1:11:53 AM

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.
March 25, 2010 4:00:47 PM

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.
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March 25, 2010 6:43:35 PM

Thanks for the reply, sminlal! I'm building up my new machine today. I'm gonna use a SATA II connector for my SSD.
April 6, 2010 7:09:07 PM

Best answer selected by binceng.