General concerns and inquiries regarding SSD's, M.2's, and SATA Express

sterlin22

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May 17, 2012
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First off, the MOBO that I'm using is a Gigabyte Z97x UD5H. It has a M.2 slot and a SATA Express slot. While I'm talking about it, I guess the first question is, can someone help me figure out what "type" of M.2 slot I have, and what "type" of M.2 devices I should be looking for when they start coming out for reasonable pricepoints in the (hopefully) near future? Same for SATA Express, assuming there is such a thing as different "types" of this component.

I ordered the Samsung 850 EVO 250GB off of Newegg a couple of days after it came out. I figured it was a bit cheaper, and still offered the vertical 3D technology that they brag about, so I wouldn't be missing out. Unfortunately though, I just now started reading the benchmarks and it seems to be noticeably behind the 850 PRO, enough to where it doesn't seem to warrant the $30 price difference, and I might as well have went for the PRO. Plus, people seem to be pissed about the fact that the 850 EVO uses "TLC" technology.

Due to the above, I was a bit disappointed, keep in mind my device is still on its way, and I've never owned a SSD before so I'm sure I'll still see a significant improvement and will be thrilled regardless. But the fact I could have went for something a good deal better for only $30 more is kinda depressing.

That was until I remembered I have both a M.2 and SATA Express slot on my Mobo (though I think you can only use one at a given time, since they're on the same sub or whatever). Meaning I can add a third storage device (I'm currently using a 1TB 7200 RPM HDD) in the future, pretty much eliminating the initial concern I have with the 850 EVO, even if it ends up being not as fast and efficient as I hope it'll be, I can always make an even better upgrade in the future, much better than even the 850 PRO due to the 10GB/s capabilities.

So that's where I have some questions:

Around what time (quarter / year preferable, unless there's more specific information of course) should we expect to see REASONABLY PRICED M.2 and SATA Express devices for sale?

What storage and speeds should we expect? And how much more, or less, will it cost in comparison to your standard SATA III SSDs?

I'd ask more specific questions but this stuff isn't my expertise.

Any and all assistance is greatly appreciated!


 
Solution
Not to worry, you did good.

Do not be much swayed by vendor synthetic SSD benchmarks.
They are done with apps that push the SSD to it's maximum using queue lengths of 30 or so.
Most desktop users will do one or two things at a time, so they will see queue lengths of one or two.
What really counts is the response times, particularly for small random I/O. That is what the os does mostly.
For that, the response times of current SSD's are remarkably similar. And quick.

They will be 50X faster than a hard drive.
In sequential operations, they will be 2x faster than a hard drive, perhaps 3x if you have a sata3 interface.

There are no sata express drives out that I know of. And m.2 may have an advantage in sequential operations only in...
Not to worry, you did good.

Do not be much swayed by vendor synthetic SSD benchmarks.
They are done with apps that push the SSD to it's maximum using queue lengths of 30 or so.
Most desktop users will do one or two things at a time, so they will see queue lengths of one or two.
What really counts is the response times, particularly for small random I/O. That is what the os does mostly.
For that, the response times of current SSD's are remarkably similar. And quick.

They will be 50X faster than a hard drive.
In sequential operations, they will be 2x faster than a hard drive, perhaps 3x if you have a sata3 interface.

There are no sata express drives out that I know of. And m.2 may have an advantage in sequential operations only in certain motherboards that can use extra pcie lanes.
I do not think it is worth much as a practical thing.

Today, you can buy pcie based ssd's that are faster in sequential operations, but not any better in random where it counts. And... they are expensive.

I see no ssd developments that will do much until the next gen of skylake motherboards are out.
 
Solution
Yeah, chill man..the fact that you are getting an SSD is the single best way to get a fast upgrade over any old spinning disk.
I plundered my savings back in 2010 and bought an Intel 160gb X25M-G2 SSD which by todays standards is Jurassic Park but still canes an HDD and am glad I did it back then. Ive recently been looking at the new M.2 SSDs and they look fab from Plextor. Geofelt is right in that the headline sequential write speeds are just that..headlines. My next 5 year rolling upgrade, due in 2015 will be a new mobo with an M.2 slot.
 

storageio

Distinguished
Aug 1, 2011
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18,520

Candidly I would say right now is a great time for electronics shopping, seeing some really good deals particular if you know what looking for, or open to options/alternatives. Suspect that there will be some even better deals just after xmas, also watch between now and early January as Consumer Electronics Show (CES) is in early January when many new things will be announced...

It depends, if your system has a good m.2 / sata express port/implementation with the right device you might get better than a regular SATA III (e.g. 6Gbs), however that will also depend on the actual SSD drive/card. Look past the interface speed/type and see what the vendor mentions for IOPs (reads/writes along with random/sequential and size) as well as bandwidth (size, read/write, random/sequential) as a better indicator. The lower cost consumer SSD tend to have lower performance than the enterprise counterparts, however how much performance do you need, vs. want and can afford?

Btw, when shopping also watch to see what the vendors advertise for TBW (e.g. TBytes Written) as this is an indicator of the drives durability (e.g. life span for doing writes).