sata 3

Rock N Roll Rebel · Jun 21, 2011

i know this is a dumb question but i have sata 2 and thinking of getting i ssd but its sata 3 will it work on a sata 2?

slyfox2151 · Jun 21, 2011

skellattarr said:
i know this is a dumb question but i have sata 2 and thinking of getting i ssd but its sata 3 will it work on a sata 2?

yes it will work exactly the same, only at half the speed of sata 3.

stevednmc · Jun 21, 2011

Itll work just fine....But if you havent bought an ssd yet why not get a Sata2 one? Itll be cheaper....unless your gonna upgrade your mobo soon...(Fingers crossed!)

DanishDevil · Jun 21, 2011

It won't be at half the speed. A lot of SATA 3 drives have read and write speeds for them running on both SATA specifications. If you're going to upgrade your motherboard within the next 6 months, get a SATA 3 drive now.

slyfox2151 · Jun 21, 2011

DanishDevil said:
It won't be at half the speed. A lot of SATA 3 drives have read and write speeds for them running on both SATA specifications. If you're going to upgrade your motherboard within the next 6 months, get a SATA 3 drive now.

since sata 2 is 300mbps and sata 3 is 600mbps.... then yes the interface is half the speed.

i never claimed the drive would be.

Rock N Roll Rebel · Jun 21, 2011

on newegg all the 128 gig drives cost around the same

DanishDevil · Jun 21, 2011

The question was about an SSD, and you said it would work at half the speed, so technically you did. Just wanted to make sure that the OP didn't misinterpret what you meant like I did.

TheOne · Jun 21, 2011

Here is an example for the OP of a SATA3 drive running at SATA2 speed.

EX: Corsair Force Series 3 120GB SATA3 running at SATA2: (ATTO Benchmark)
Corsairs Benchmarks can be found here: http://www.corsair.com/blog/corsair-force-series-3-ssds-are-now-with-us/

(Corsair Rated Write: 510MB)(Half: 255MB)
SATA2 Score: 260MB Write

(Corsair Rated Read: 550MB)(Half: 275MB)
SATA2 Score: 277MB Read

DanishDevil · Jun 21, 2011

I'd be curious to see a Crucial M4, Intel 510, or Corsair P-3 on both tests. I don't think it's going to cut them in half.

Running a SATA 3 SSD on SATA 2 will not cut its read/write speeds in half. It will simply limit the maximum reads/writes at about 260MB/s (which is the realistic limit of SATA 2)

Sandforce controllers are spec'd to completely saturate the SATA specification that they were created for, and SATA 3 has twice the bandwidth of SATA 2, which is why your theory works for Sandforce drives, but not with others.

TheOne · Jun 21, 2011

DanishDevil said:
I'd be curious to see a Crucial M4, Intel 510, or Corsair P-3 on both tests. I don't think it's going to cut them in half.

http://images.anandtech.com/graphs/graph4253/36345.png

Running a SATA 3 SSD on SATA 2 will not cut its read/write speeds in half. It will simply limit the maximum reads/writes at about 260MB/s (which is the realistic limit of SATA 2)

Sandforce controllers are spec'd to completely saturate the SATA specification that they were created for, and SATA 3 has twice the bandwidth of SATA 2, which is why your theory works for Sandforce drives, but not with others.

Are you talking to me?

DanishDevil · Jun 21, 2011

Anybody who is debating that a SATA 3 drive will run at half speed on SATA 2. I found it intriguing and counter-intuitive that speeds were half for Sandforce 2000 drives, so I did some research to disprove that.

TheOne · Jun 21, 2011

DanishDevil said:
Anybody who is debating that a SATA 3 drive will run at half speed on SATA 2. I found it intriguing and counter-intuitive that speeds were half for Sandforce 2000 drives, so I did some research to disprove that.

I don’t think anybody has made that claim, but indeed, performance will vary depending on controller, SF of course being the fastest available at the moment.

xBruce88x · Jun 21, 2011

I'll put it this way... on a SATA 3.0gbs connection the drive will not exceed 300MB/sec. however on a sata 6.0Gbs connection, it will perform at its max speed (i've yet to see one at 600MB/sec, 514MB is the highest i've seen i think)

either way... its faster than any HDD you'll find (non insane industrial kind anyway)

basically the same idea as running a SATA3.0Gb/sec drive on a SATA1.5Gb/sec controller

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