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SATA1 vs SATA2 vs SATA3

post #1 of 18
Thread Starter 
What is the real-world difference between those? The 1.5-6Gb/s doesn't mean anything to me.
post #2 of 18
For single configuration hard drives SATA3 is pointless, but for SSDs, the extra bandwidth really helps.

Some hard drives are still able to saturate the SATA1 specifications.
    
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post #3 of 18
Quote:
Originally Posted by newn View Post

What is the real-world difference between those? The 1.5-6Gb/s doesn't mean anything to me.

Gb/s reads Gigabits per second, to covert that to Gigabyte (GB) per second you have to divide by 8.

So

SATA I 1.5 Gb/s = 0.1875 GB/s= 187.5 MB/s

STAT II 3.0 Gb/s = 0.375 GB/s = 375MB/s

STAT III 6.0 Gb/s = 0.75 GB/s= 750 MB/s

HDD max read speed is < 200 MB/s (write would be even slower)

new SSD read/write <= 550 MB/s

So SATA II would be plenty for HDDs and SATA II SSD(old ones, write speed < 300), you only need SATA III for new SATAIII SSDs
Edited by sherlock - 11/21/12 at 8:40am
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post #4 of 18
Real-world consumer difference is actually little.... except when someone is doing file transfers. Most operations are random access.

With HDDs, there is no real difference between SATA 3Gbps and 6Gbps because they cannot come close to staturation.


(Note there are technical differences other than just throughput like NCQ and power management but these generally have little impact on most people.)
Quote:
Originally Posted by sherlock View Post

Gb/s reads Gigabits per second, to covert that to Gigabyte (GB) per second you have to divide by 8.
So
SATA I 1.5 Gb/s = 0.1875 GB/s= 187.5 MB/s
STAT II 3.0 Gb/s = 0.375 GB/s = 375MB/s
STAT III 6.0 Gb/s = 0.75 GB/s= 750 MB/s
HDD max read speed is <= 200 MB/s (write would be even slower)
new SSD read/write <= 550 MB/s
So SATA II would be plenty for HDDs and SATA II SSD(old ones, write speed < 300), you only need SATA III for new SATAIII SSDs
You forgot to account for 8b/10b encoding.

SATA 1.5Gbps = 150MB/s
SATA 3Gbps = 300MB/s
SATA 6Gbps = 600MB/s

Plus there is some protocol overhead as well.
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post #5 of 18
Depends on what you're using (i.e. HDD or SSD, or DVD (optical drive)) - if you're using an optical drive or regular HDD, you're not going to be all that limited on speeds, SATA 2 3Gb/s is good up to ~ 290mb/s read and write vs. 6Gb/s is good up to ~ 600mb/s read / write (which is all not including RAID)

Conventional HDD's do up to ~ 150mb/s on the fastest ones, so you would be fine if you had a SATA I, a SSD would be severely limited.
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post #6 of 18
SATA II also brought in a few things such as NCQ.
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post #7 of 18
Thread Starter 
So basically if I am not going for an SSD, you're even alright with SATA1? To play games, watch movies, play music, record videos, do video encoding, image editing, etc.?

beers are the new things useful not in server machines, for use like I've just mentioned, no raids, no SSDs, etc.?
post #8 of 18
Honestly you are fine no mater what you use. For example, If you are gaming you will never be reading more than 150MB a second for a prolonged period of time...

Real world, you won't see a difference between SATA 2 and 3...on SATA 1 you might notice slower boot times and load times if you really looked for it. The benefits of better SATA are really meant for the server arena, but it isn't like they hurt the general end user either. I am sure there will brief instances where it helps, but nothing you can really document...not including benchmarks
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post #9 of 18
Quote:
Originally Posted by newn View Post

So basically if I am not going for an SSD, you're even alright with SATA1? To play games, watch movies, play music, record videos, do video encoding, image editing, etc.? To use a computer
beers are the new things useful not in server machines, for use like I've just mentioned, no raids, no SSDs, etc.?

Fixed. A hard drive doesn't care what kind of data you're storing on it.
It will work and shouldn't present a significant performance loss in a SATA I port.

I have an SSD in my laptop on a SATA 1.5 Gbps port and it's still quite snappy.
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post #10 of 18
Quote:
Originally Posted by Vagrant Storm View Post

Honestly you are fine no mater what you use. For example, If you are gaming you will never be reading more than 150MB a second for a prolonged period of time...
Real world, you won't see a difference between SATA 2 and 3...on SATA 1 you might notice slower boot times and load times if you really looked for it.

Just a note... NCQ is not supported on SATA 1.5Gbps. SSDs use NCQ to help increase the number of request and will take a performance hit without it enabled.
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