Difference between m.2 and PCIE

[JackDoyne]

What is the difference between a PCIE SSD and m.2 SATA SSD? 

 

[Zaki_Owais]

M.2 sata is an space saving option over an two and half inch ssd

PCIE ssd are connected directly to the cpu and doesn't have 600 MB/s bottleneck,thus providing faster overall perfomance over an sata ssd which has has a bottleneck

You might know that m.2 also capable of pcie  ssd's speed

[JackDoyne]

What about those adapters? 

PCI to m.2? do they have a bandwidth limit because of the PCI lane? 

[typographie]

29 minutes ago, JackDoyne said:

What is the difference between a PCIE SSD and m.2 SATA SSD? 

By PCIe I assume you mean something like the Intel SSD 750 that literally plugs into a PCIe slot like a graphics card or sound card would. M.2 is just a form factor and a slot. Some M.2 SSDs are still SATA and perform no differently from ordinary 2.5" SATA SSDs, and some are M.2 NVMe which communicate over PCIe.

 

I assume there's not much performance difference between NVMe SSDs that plug into M.2 versus those that plug into PCIe directly. Both are supposed to get 4 PCIe 3.0 lanes, so they should have the same bandwidth available. Any performance differences would likely come from the drives themselves.

[Ordinarily_Greater]

29 minutes ago, JackDoyne said:

What is the difference between a PCIE SSD and m.2 SATA SSD? 

 

PCIe SSDs look like Graphics Card.

 

while m.2 has it own slot

[JackDoyne]

One of these i mean 

[agent_x007]

^That is M.2 drive in PCIe to M.2 adapter. 

(M.2 uses PCIe to communicate, ie. it "talks" to pcie controller directly)

 

Adapter speed is limited by PCIe version MB/CPU supports, and what drive itself uses (gen 2.0/3.0 and x2/x4 link).

Ps. There are AHCI M.2 drives that utilise PCI-e (or M-Key), as well.
Example SM951 AHCI : LINK.

[LucasRem]

NVMHCI is the logical device interface for non volatile storage over the PCIe bus.

 

2.5-inch form-factor NVM devices that provide a four-lane PCI Express interface through the U.2 connector, or using the M.2 interface for internally mounted computer expansion cards on the board through a PCIe max 4x interface.