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SATA 6 vs USB 3 speeds

post #1 of 45
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I have read that USB 3 is faster than SATA 6, but using HD Tune Pro Sata 6 is faster than USB 3. Below are read benchmarks and the 2TB HD's plugged into a Sata 6 port is faster by far than a 2TB USB 3 WM My Passport plugged into a USB 3 port.

LaCie d2 Quadra 2TB eSATA HD (this is also USB 3.0, but I am using it as eSATA)
http://www.newegg.com/Product/Product.aspx?Item=9SIA1J20UC1358



WD Black 2TB 7200 RPM 64MB cashe STAT 6 HD
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136792



WD 2TB USB 3.0 My Passport HD
http://www.newegg.com/Product/Product.aspx?Item=N82E16822236187


According to HD Tune Pro the USB 3 HD plugged into a USB 3 port is a lot slower than HD's plugged into SATA 6 ports, is what I am seeing correct?
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post #2 of 45
The SATA III (what you're calling SATA 6) Standard has a top end speed of 6.0Gbps. Most MOBOs with SATA III ports (including e-SATA) run them at 5 or 6Gbps, depending on the chip being used. HDDs have barely saturated SATA II speeds, if at all.

USB 3.0 tops out at 5Gbps. Most MOBOs with USB 3.0 haven't been running at the full rated speed (to qualify as USB 3.0, it only has to run faster than USB 2.0). Adding insult to injury, many, if not most, USB 3.0 devices don't run at full USB 3.0 speeds. In theory, since HDDs don't run much faster than USB 2.0 speeds, they should be just as fast on USB 3.0 as they would be on SATA III but, in actuality, it hasn't worked out that way yet.
     
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post #3 of 45
The only truly good USB3 chipset are the NEC/Renesas ones. The others are pretty junky, especially those eTron ones.

If you want the best USB3 performance with external drives, get a PCI-E card with an NEC chip on it, and save the onboard USB3 ports for lower bandwidth stuff.
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post #4 of 45
Quote:
Originally Posted by FastMHz View Post

The only truly good USB3 chipset are the NEC/Renesas ones. The others are pretty junky, especially those eTron ones.

If you want the best USB3 performance with external drives, get a PCI-E card with an NEC chip on it, and save the onboard USB3 ports for lower bandwidth stuff.

Can you suggest any? Especially any that use more than one PCI-e lane?
     
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post #5 of 45
I'm not aware of any that use more than 1 lane, but any of these fit the bill.
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post #6 of 45
Quote:
Originally Posted by FastMHz View Post

I'm not aware of any that use more than 1 lane, but any of these fit the bill.

What I can't understand is why manufacturers are making cards that have more than one USB port per PCI-e lane. On a card that uses only one PCI-e lane, all the USB 3.0 ports will have a combined bandwidth of one port. If you have four ports actually being used at the same time, each port will be able to run at only 1/4 speed.

I've found only one card that has one PCI-e lane for each port: Syba Model SI-PEX20148.



I would love to get a card like that runs on four PCI-e lanes and has two USB 3.0 ports on the rear and an internal 20 pin USB 3.0 header (even better would be one that runs on eight lanes and has six ports and a 20 pin header). I checked with Syba and they said they had no plans to make anything like that.
     
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post #7 of 45
Quote:
Originally Posted by FastMHz View Post

The only truly good USB3 chipset are the NEC/Renesas ones. The others are pretty junky, especially those eTron ones.

If you want the best USB3 performance with external drives, get a PCI-E card with an NEC chip on it, and save the onboard USB3 ports for lower bandwidth stuff.

Am I missing something? OP has a Haswell system, so his onboard would use the best possible USB3 chipset - Haswell (native).
post #8 of 45
I'm not familiar with the Intel controllers. I was referring to the add-on chips found on many motherboards and cards to provide USB3 functionality. If an add-in card is needed in OPs case, the NEC chipset is the only way to go - and may still be better than the Intel one, but we need benches and such to determine that.
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post #9 of 45
Quote:
Originally Posted by Lady Fitzgerald View Post

What I can't understand is why manufacturers are making cards that have more than one USB port per PCI-e lane. On a card that uses only one PCI-e lane, all the USB 3.0 ports will have a combined bandwidth of one port. If you have four ports actually being used at the same time, each port will be able to run at only 1/4 speed.

I've found only one card that has one PCI-e lane for each port: Syba Model SI-PEX20148.



I would love to get a card like that runs on four PCI-e lanes and has two USB 3.0 ports on the rear and an internal 20 pin USB 3.0 header (even better would be one that runs on eight lanes and has six ports and a 20 pin header). I checked with Syba and they said they had no plans to make anything like that.

That card has an Etron chip.
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post #10 of 45
idahosurge, it's absolutely normal for USB speed to be lower than SATA speed. It just isn't as efficient for data transfer. Besides this, SATA6's max speed is higher than USB3's theoretical max, and also the portable USB3 drive that you listed at the bottom would be an inherently slower drive than the other two anyway, having a slower rotational speed tongue.gif. However I did find this review:

http://techgage.com/article/western_digital_my_passport_2tb_portable_hard_drive_review/3/

in which the speed you achieved seems consistent with the drive running on a USB 2.0 port. Are you certain that your drive is connected to a USB 3.0 port?

Edit: As ShortySmalls says, it's SATAIII, not Sata6 (no doubt you were thinking of 6Gbps, and I just had a brainfart)
Quote:
Originally Posted by FastMHz View Post

I'm not familiar with the Intel controllers. I was referring to the add-on chips found on many motherboards and cards to provide USB3 functionality. If an add-in card is needed in OPs case, the NEC chipset is the only way to go - and may still be better than the Intel one, but we need benches and such to determine that.
OP's problem isn't the USB3 implementation. I couldn't find benches, but I did find this:

http://www.tomshardware.com/reviews/usb-3-uas-turbo,3215-2.html

where they clearly mention that the Intel implementation is best. It makes sense too, since Intel helped define USB3, and its implementation doesn't require workarounds or extra hardware. The general consensus around the 'net seems to agree that native beats out third party.
Edited by dukeReinhardt - 2/9/14 at 5:31pm
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