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[Test] How fast USB3.0 vs USB2.0 vs Sata 2 ?, 2-3x Faster !!
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kaiserreich
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 Jan 31 2010, 11:37 AM
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The PCIE card + enclosure is so expensive.
I mean, an old eSATA + USB 2.0 3.5" enclosure costs RM120
And the card, maybe Rm50 - 60 if you check ' international ' price.
Probably the supplier is trying to make a killing setting the MSRP high. i.e. the early adopter's tax
I mean, for the time being, you can probably use eSATA at home, and USB 2.0 at your friend's computer when you want to transfer stuff over, just like how you would use USB 3.0 at home and USB 2.0 when you want to transfer stuff over.
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Radeon
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Jan 31 2010, 11:54 AM
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QUOTE(everling @ Jan 26 2010, 01:04 PM) By raw bandwidth: SATA 6 Gb/s (3.0) > USB 3.0 (5 Gb/s) > SATA 3 Gb/s (2.0) > SATA 1.5 Gb/s (1.0) > USB 2.0 (480 Mb/s) that's only by specs on papers for instance the ssd test is only clocking at 120 + mb/s tats only 1/6 of usb 3.0's speed on papers. |
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everling
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Jan 31 2010, 03:41 PM
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I agree that those are specs on paper. But there is one more factor to consider, the SSD given cannot hit SATA 3 Gb/s's maximum limit, so it is the bottleneck and not USB 3.0.
But it does seem to be slower than other benchmarks of the same drive.
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tungkw
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Jan 31 2010, 04:03 PM
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Getting Started
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This is normal. The more converter used, the more time delay it will be.
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Jcsy
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Jan 31 2010, 07:05 PM
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QUOTE(everling @ Jan 26 2010, 01:04 PM) By raw bandwidth: SATA 6 Gb/s (3.0) > USB 3.0 (5 Gb/s) > SATA 3 Gb/s (2.0) > SATA 1.5 Gb/s (1.0) > USB 2.0 (480 Mb/s) this post was the clearest in terms of raw data however there are alot of other factors determining speeds n end performance but understood now its roughly around there |
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pillage2001
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Feb 1 2010, 12:55 AM
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QUOTE(everling @ Jan 26 2010, 08:13 PM) Those are the theoretical specification limits of the raw bandwidth. The actual bandwidth will be significantly lower, depending on the efficiency of the protocol used. USB 2.0's 480 Mbit/s raw bandwidth is equal to 60 megabyte/s transfer rate, but it's normally bottlenecked to about 30 megabyte/s transfer rate because of the protocol. SATA's protocol efficiency is 80% (due to the 8b/10b data transfer protocol used) and plus some overhead, so the 3 Gbit/s is 2.4 Gbit/s actual or 300 megabyte/s, excluding additional protocol overhead. And from the SSDs, they seem to be bottlenecked to about 250+ megabyte/s instead of hitting that 300 megabyte/s ceiling. eSATA is based on SATA 1.5 Gb/s (1.0), so it is slower than SATA 3 Gb/s (2.0). For those interested in what the future might bring us and haven't heard of Light Peak, take a look at Light Peak. Esata follows the speed of the Sata controllers speed. The newer P55 chipsets have esata at gen2 speeds now/ |
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mumeichan
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Feb 4 2010, 05:14 PM
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QUOTE(tungkw @ Jan 26 2010, 05:46 PM) USB3 enclosure using SATA2 HDD inside, cannot be faster than eSATA enclosure using SATA2 HDD right? Since SATA2 HDD is the bottleneck. The main bottleneck will be your maximum HDD write speed, which is much lower then SATA2. Even the maximum read of Intel's Gen 2 SSD are almost the same as SATA2's bus speed. So using a USB3 casing won't make it go any faster, in fact it will be slower if the USB3 controller sucks. Intel's Gen3 SSD will supposedly be almost as fast at the bus speed of SATA3 QUOTE(everling @ Jan 26 2010, 08:13 PM) eSATA is based on SATA 1.5 Gb/s (1.0), so it is slower than SATA 3 Gb/s (2.0). Wrong. eSATA is not a controller standard, it's just a standard of the shape of physical port/connector. It will be as fast as the SATA controller on your motherboard. |
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everling
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Feb 4 2010, 09:16 PM
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QUOTE(pillage2001 @ Feb 1 2010, 12:55 AM) Esata follows the speed of the Sata controllers speed. The newer P55 chipsets have esata at gen2 speeds now/ QUOTE(mumeichan @ Feb 4 2010, 05:14 PM) Wrong. eSATA is not a controller standard, it's just a standard of the shape of physical port/connector. It will be as fast as the SATA controller on your motherboard. Thanks for the correction.  This post has been edited by everling: Feb 4 2010, 09:16 PM |
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