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What is the speed of 840 pro when used on a USB 2.0 port?

post #1 of 7
Thread Starter 
Does it have a resemblance to its real max speed? I do not plan to use it now, just wondering.
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post #2 of 7
About 40MB/s max for read and write looking around.

Compared ~500MB/s on Sata 3
post #3 of 7
Thread Starter 
Hrm. A disaster then. Thanks, +rep.
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post #4 of 7
Hold on, your desktop PC has USB 3.0 ports, and it's possible your mobile PC does too. A USB 3.0 enclosure is not terribly expensive, and would provide a big performance boost with that SSD over USB 2.0.

This is a benchmark of an "old" Intel 80GB SATA II SSD in a USB 3.0 enclosure connected to a USB 3.0 port:



The sequential read and write speed specs for this SSD are 250MB/s and 80MB/s respectively.

As can be seen, the sequential, large file read and write speeds are not far off spec. ~200MB/s read speed from a USB (3.0) device is not bad at all.

Of course you lose NCQ support using the USB interface, but the small file (4K) read and write speeds are not terrible, and many times faster than any HDD on a SATA interface. Access times are also not terribly degraded, assuming they are correct (the single read and write access time readings are hopefully an average, and not a minimum figure.)

It looks like booting an OS from that SSD in the USB 3.0 enclosure would be faster than a HDD on a SATA port.

I never tried that SSD on a USB 2.0 port, but I imagine it would provide the maximum real world speed possible for USB 2.0.
post #5 of 7
Quote:
Originally Posted by parsec View Post

Hold on, your desktop PC has USB 3.0 ports, and it's possible your mobile PC does too. A USB 3.0 enclosure is not terribly expensive, and would provide a big performance boost with that SSD over USB 2.0.

Even if his PC has USB 3.0, the Samsung 840 Pro still isn't worth the price premium as realistically speaking, we're looking at around 400 MB/s with UASP and just around 250 MB/s with bulk transfer. Most of the cheap enclosures are also limited to SATA II so that's another possible bottleneck.

Quote:
Originally Posted by parsec View Post

It looks like booting an OS from that SSD in the USB 3.0 enclosure would be faster than a HDD on a SATA port.

I've actually tested this (SATA II HDD and USB 2.0 SSD). From memory, using identical virtual machines, the Kingston SSDNow V 40GB (Intel X25-V 40GB rebadge) connected to a measly USB 2.0 port finished booting 20 seconds faster than a Samsung Spinpoint F1 1TB connected via SATA II.
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post #6 of 7
Quote:
Originally Posted by rui-no-onna View Post

Even if his PC has USB 3.0, the Samsung 840 Pro still isn't worth the price premium as realistically speaking, we're looking at around 400 MB/s with UASP and just around 250 MB/s with bulk transfer. Most of the cheap enclosures are also limited to SATA II so that's another possible bottleneck.

If it will be used only in a USB enclosure, I agree. I really did not comment on, nor did the OP ask if it was a good choice for a USB enclosure... wink.gif
Quote:
Originally Posted by rui-no-onna View Post

I've actually tested this (SATA II HDD and USB 2.0 SSD). From memory, using identical virtual machines, the Kingston SSDNow V 40GB (Intel X25-V 40GB rebadge) connected to a measly USB 2.0 port finished booting 20 seconds faster than a Samsung Spinpoint F1 1TB connected via SATA II.

HA! That is funny and no doubt true! Unless you need a storage device to be very small, why carry data on a USB 3.0 flash drive when you can use a SSD in a USB 3.0 enclosure.
post #7 of 7
Quote:
Originally Posted by parsec View Post

If it will be used only in a USB enclosure, I agree. I really did not comment on, nor did the OP ask if it was a good choice for a USB enclosure... wink.gif
HA! That is funny and no doubt true! Unless you need a storage device to be very small, why carry data on a USB 3.0 flash drive when you can use a SSD in a USB 3.0 enclosure.

Yep. $/GB, high end USB 3.0 flash drives are more expensive than SSD+enclosure. Instead of enclosures, I actually just use SATA to USB 3.0 adapter cables for the ones I use as "flash drives". Makes it a lot easier to swap SSD's.
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