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m.2 vs. SATA III Real World Difference?

post #1 of 4
Thread Starter 
Hey guys,

I'm in the market for a new laptop, just waiting around for a good deal from Dell. Quick question. The laptop I'm looking at has both a SATA III and also m.2 sata drive. I've been noticing that the m.2 drives have WAY higher IOPS and read/write scores. Especially some drives like this, this, or this.

I'm wondering if I'd experience any real benefit over that of a "normal" ~500mb/sec read/write SSD that's SATA III? I would think another advantage of the m.2 port is that the laptop would be slightly lighter than if I were to have a full size SATA drive.


Thanks guys!
post #2 of 4
M.2 sata will have no advantage over a normal sata drive as they both use the limited sata III interface. If you want a faster M.2 drive you'll have to find one which uses m.2 pcie rather than sata, such as a samsung 950 evo
Edit: only just clicked the links, the ones you showed are m.2 pcie not m.2 sata. I'm not sure which dell you're looking at but make sure it is pcie m.2 not sata if you're looking for the extra speed. I'm also not sure what real world difference you'll see between these unless you're transferring large files or accessing large files such as when video editing etc
Edited by SnakeBiteScares - 2/1/16 at 9:42am
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Beastly SFF
(15 items)
 
 
Asus ZenFone 2
(7 items)
 
CPUMotherboardGraphicsRAM
i7 6700k Gigabyte GA-Z170N-WIFI Gigabyte GeForce GTX Titan X Corsair Vengeance LPX 16GB (2x8GB) DDR4 2400MHz 
Hard DriveHard DriveHard DriveCooling
120GB Samsung 850 Evo M.2 500GB Samsung 850 Evo 240GB OCZ Trion Noctua L9i 
OSMonitorKeyboardPower
Windows 10 Home Iiyama XU2390HS 23" 1920x1080 71Hz Das Keyboard 4C with custom keycaps Silverstone SX500-LG 500W 
CaseMouseAudio
Silverstone ML08B-H Logitech G502 Proteus Core Sennheiser HD598SE 
CPUMotherboardGraphicsGraphics
Intel i7 4790k @ 5GHz MSI Z97S Krait Edition XFX R9 270X XFX R9 270X 
RAMHard DriveHard DriveCooling
16GB Kingston HyperX 1600MHz WD Blue 1TB 7200RPM WD Blue 1TB 7200RPM Noctua DH14 
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Windows 10 32" Philips TV 1366x768 Logitech G910 Orion Spark EVGA SuperNova 1000W 80+ Gold 
CaseMouseMouse PadAudio
Zalman Z5 Mad Catz Rat 5 A4 Page Superlux HD668B 
CPUGraphicsRAMHard Drive
Intel Atom Z3580 2.33GHz PowerVR Rogue G6430 457MHz 4GB LPDDR3 64GB Internal + 64GB SD 
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post #3 of 4
Thread Starter 
Quote:
Originally Posted by SnakeBiteScares View Post

M.2 sata will have no advantage over a normal sata drive as they both use the limited sata III interface. If you want a faster M.2 drive you'll have to find one which uses m.2 pcie rather than sata, such as a samsung 950 evo
Edit: only just clicked the links, the ones you showed are m.2 pcie not m.2 sata. I'm not sure which dell you're looking at but make sure it is pcie m.2 not sata if you're looking for the extra speed. I'm also not sure what real world difference you'll see between these unless you're transferring large files or accessing large files such as when video editing etc

I believe the m.2 slot is PCIe compatible. So then yes, I can support the PCIe 4x that it requires for the faster drives.
post #4 of 4
^^^^ This,.

The drives you listed are M.2. PCIe units, and you're discussing M.2. SATA in the message. M.2 SATA is the older standard, and offers the SAME speed as SATA III 2.5" SSDs. M.2. PCIe has up to x4 bandwidth, and has the potential for much lower I/O latency and much higher raw bandwidth. Be sure to observe specifications carefully, there are laptops with M.2 SATA and some laptops with M.2. PCIe. There is a keyway in the M.2 slot that will prevent inserting a M.2 PCIe device into a M.2 SATA slot.

Greg
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