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Samsung 840 non Pro on SATA 2?

post #1 of 9
Thread Starter 
What read and write speeds should i expect on sata 2 ?
Does that mean i'll be getting half performance compare to sata 3?
Samsung listen 250GB samsung 840 non pro on sata 3 to have
Read: max. 540MB/sec
Write: max. 250MB/sec

Which means it'll be only 125MB/sec on write? thinking.gif
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post #2 of 9
225.20 /mb /sec
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post #3 of 9
Quote:
Originally Posted by insyxion View Post

What read and write speeds should i expect on sata 2 ?
Does that mean i'll be getting half performance compare to sata 3?
Samsung listen 250GB samsung 840 non pro on sata 3 to have
Read: max. 540MB/sec
Write: max. 250MB/sec

Which means it'll be only 125MB/sec on write? thinking.gif

It's not SATA 2 or 3.... it's SATA 3Gbps or 6Gbps.


Max sequential read/write will be 230-280MB/s on SATA 3Gbps.


However, sequential read/write doesn't matter much for applications/OS. Random read/write is MUCH more important and they won't be bottlenecked by SATA 3Gbps.
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post #4 of 9
Actually you should still get near the rated write speed, up to the maximum transfer rate of the SATA II interface. It only starts slowing down when one part of the system is "bottlenecking" the transfer. If it was on SATA I, then you may only see about 150MB/s (theoretical - it would probably be slightly slower). SATA II can do 300MB/s Theoretical, so in this case it shouldn't limit your write speed. Reading on the other hand WOULD be limited by the interface, so you read speed would be a max of 300MB/s, not 540MB/s. The interface, not the drive becomes the limiting factor in this case.

In the real world scenario though, I doubt you'll notice the difference too much, the SSD on a SATA II interface is still going to be a vast improvement over an HDD.
post #5 of 9
Quote:
Originally Posted by insyxion View Post

What read and write speeds should i expect on sata 2 ?
Does that mean i'll be getting half performance compare to sata 3?
Samsung listen 250GB samsung 840 non pro on sata 3 to have
Read: max. 540MB/sec
Write: max. 250MB/sec

Which means it'll be only 125MB/sec on write? thinking.gif
Why would write speed be cut in half? Seq speeds would just be limited to the max bandwidth of SATA 3Gb/s if you don't have SATA 6Gb/s.
post #6 of 9
Thread Starter 
Alright guys thanks for input..

Correct me if i'm wrong.

So i should be getting around 300 MB/sec on read and 250 MB/sec on write? So basically sata 2 is not going to bottleneck the write speeds therefore it'll stay around 250 MB/sec

Currenty samsung 250GB cost around 160€. i'm very tempted to purshare one, but i'm kinda worried about the life time of that particular SSD, but it uses TLC and not MLC, i've heard sort of things about TLC.. thinking.gif
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post #7 of 9
Your speeds , both write and read will be around 250mb/s. You won't have any problem with the tlc. It will last way more than 250tb of writes (rated for at least 1000p/e) . So even if you write 20gb/day (which you won't) it will last more than 250000/(20x365)= 34 years
post #8 of 9
Either HP sent me an SATA II cable for the HDD expansion or the laptop motherboard's second SATA port is SATA II

This is what the 840 will look like on SATA II


On my desktop with SATA III it has the 540mb read speed

Yes it's the 250gb one
Edited by Kiros - 1/16/13 at 7:13pm
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post #9 of 9
There is no difference between SATA cables that would cause a SATA 6Gb/s SSD to operate at SATA 3Gb/s speeds. It must be the chipset on your laptop, or that HP only uses one SATA 6Gb/s connection.
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