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Sequential Speed Importance

post #1 of 8
Thread Starter 
I'm looking to buy a msata for my laptop. The intel 310 40gig would be no problem for me if its sequential writes weren't twice as slow as the 80gig version. How will this slow sequential write impact its usage?

40Gig
- Seq read: 170MB/s
- Seq write: 35MB/s

80Gig
- Seq read: 200MB/s
- Seq write: 70MB/s
post #2 of 8
You don't really need to worry about the sequential, more the IOPs which has an impact in every day runnings.

You need to remember that you, most likely, will never really need the write speed - you install something, its done. The difference of 6 minutes vs 8 in a program install is very much negatable.

30mb read difference? You wouldn't notice.

Check the IOPs though, if theres a big difference between the two - there shouldn't be - go with the one with a better IOPs, as this helps is 99.99% the reason an ssd has an advantage over a normal hdd - its the random read/write it can do per second. Obviously, the more it can read/write, the more data it can push through per second.

Just like a highway, 4 lanes are better than 2 -60,000 IOPS is better than 30,000, by a long shot.

You'll only really notice these speeds, again, in gaming or applications which require heavy loadings to your RAM.
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post #3 of 8
Thread Starter 
Hm, there's actually quite a bit of difference between the 40g and 80g.

40g
Random 4 KB reads: Up to 25 K IOPS
Random 4 KB writes: Up to 2.5 K IOPS

80g
Random 4 KB reads: Up to 35 K IOPS
Random 4 KB writes: Up to 6.6 K IOPS

I'm not sure though if the 80g is worth investing $100 more (in terms of speed, I don't think size is going to be too big of an issue).
post #4 of 8
If this is for a W7 OS boot drive, then go the 80GB... theres a good chance the 40GB won't be enough once drivers are taken into consideration and any essential software, particularily if your a PS user or the like...

What is the 40GB costing?

I look at it like this whenever I buy a new HDD..

What is the cost of two HDD's to form the equivilent of the 1?

I.e.

2 x 40GB = 80 GB @ $400
or
1 x 80GB = 80GB @ $360

Paying $160 for an extra 40GB, as opposed to $200 extra for the same space.

Now, you'd get a raid option on the two hdd's, and faster speeds accross the board, but loose one storage bay, draw more power (admitedly not much) and loose trim, although thats getting negatable at this point also, as GC (Garbage Collection) cleans up for you akin to the TRIM function.

For me, even though its unlikely I'd ever fill all my HDD bay's, I like to have the freedom of choice that comes with them being free.

Its up to you, but the price per GB will almost always go down with the larger HDD. If you get a good one to begin with, you'd never need to RAID it. =]

Its also worth noting that SSD's run better when their not choc-full of data =P

Maybe look at an OCZ 60GB if you can find one?
Edited by Blaze182 - 5/8/11 at 7:16pm
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post #5 of 8
Thread Starter 
40g = $100
80g = $190

The problem is that this is for a laptop and not only that, it needs to be a msata. There aren't many options. I don't plan on putting windows on it so if I put size out of the factors, I won't be seeing a noticeable speed difference right?
post #6 of 8
stick with windows. not sure if any other OS will support trim. without trim after a couple months the ssd will be slower than a regular hd. 80gb is not worth it on a laptop. just get a 7200rpm hd
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post #7 of 8
What laptop do you have? Only a few laptops actually support mSATA.

Also, how much space you using now? I would not worry about performance... either are MUCH faster than a HDD.
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post #8 of 8
Thread Starter 
I don't plan on using Windows as my main OS, so I don't see why I should base my judgement on that.

Laptop = x220

I already have a HDD with 250Gig of space and I have an external HDD also, so space really isn't an issue.

The reason I am getting an msata is because it lets me have both an SSD and a HDD on my laptop.

From the responses, looks like I'm fine with the 40gig version. Thanks for all the input.
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