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Half SSD Rated Speeds In ATTO

post #1 of 24
Thread Starter 
Hey Guys,

I've recently gotten a Corsair Force 3 120GB SSD to use for my boot and essential programs.

I Followed the guides here to install it, on AHCI and everything else, trim is working and everything is as it should be... apart from the speeds,

EVERYTHING is responsive and quick, but looking at the ATTO bench mark something is not right?



(I know 270mb/s is quick but its half the advertised speed on the same bench...?

I'm running it on the Intel Controller SATA-II again all set at AHCI

The ONLY thing i can think is that its a SATA-III drive and it needs the faster interlink to reach top speeds? but even at 3Gb/s its coming nowhere near saturating it?

Anyway i've got a PCI-E SATA-III card coming today, maybe it will help, any suggestions would be welcome, (baring in mind i followed to the LETTER the SSD optimisation and installation guide found on here from 2 cables)

Thanks in Advance

PS. the Firmware is 1.2 as i had no problems with it it was advised by Corsair not to update the firmware (another possible cause)
Edited by ChosenLord - 8/26/11 at 3:04am
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post #2 of 24
Got it plugged into the native sata ports and not the blue jmicron or whatever it is?
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post #3 of 24
Thread Starter 
Yeah man, its in the first sata-II port, not the jmicron.

Do you think it could be a sata-I cable ? would that limit the speeds?
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post #4 of 24
Your numbers are fine. The drive will never run at 100% of the Sata II speed, no drive will. 283 out of 300 is fine is pretty much perfect.
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post #5 of 24
That is basically the maximum speed you can attain using Sata 3 Gb/s, at least with any Sata Rev2 drive that I have seen (a little less than the theoretical max). Yes a Sata 6 Gb/s card should improve your speeds significantly.
Edited by mdatmo - 8/26/11 at 3:34am
 
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post #6 of 24
Thread Starter 
Like I say its still pretty fast, but the FORCE 3 is supposed to run at 550mb/s READ and 510mb/s Write...

http://www.corsair.com/ssd/force-ser...ard-drive.html

I'm thinking it must be either SATA-II limitations (which seems unlikely) or i've somehow managed to use a SATA-I cable? not even sure if that would make a difference...
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post #7 of 24
Quote:
Originally Posted by ChosenLord View Post
Like I say its still pretty fast, but the FORCE 3 is supposed to run at 550mb/s READ and 510mb/s Write...

http://www.corsair.com/ssd/force-ser...ard-drive.html

I'm thinking it must be either SATA-II limitations (which seems unlikely) or i've somehow managed to use a SATA-I cable? not even sure if that would make a difference...
In Sata III, you'd see those speeds. You aren't using a Sata III connection.

In theory, the cable should not matter. In reality, not all Sata II cables can reliably run at Sata III speed.
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post #8 of 24
SATA2 is 3gbit (bits, not bytes), which you might assume divides to about 375MB/sec - but SATA uses some error correction (called, 8b/10b encoding) so you actually end up with 300MB/sec. Also, that's metric MB/sec rather than ~1024 MB/sec (MiB), so you actually have, ~286.1MiB/sec. (What Windows calls Megabytes)

Your read speeds are surprisingly close to that.
     
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post #9 of 24
There is no such thing as a SATA I or II or III cable. A SATA cable is a SATA cable, now it might be a low quality one which introduces a lot of error correction but you don't need to get conned into buying "SATA III" special cables.

Your speeds look totally as one would expect for that drive connected to a decent SATA 3GB/s port.
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post #10 of 24
Quote:
Originally Posted by Kramy View Post
SATA2 is 3gbit (bits, not bytes), which you might assume divides to about 375MB/sec - but SATA uses some error correction (called, 8b/10b encoding) so you actually end up with 300MB/sec. Also, that's metric MB/sec rather than ~1024 MB/sec (MiB), so you actually have, ~286.1MiB/sec. (What Windows calls Megabytes)

Your read speeds are surprisingly close to that.
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