Question Hi all, M2SSD+USB3 Evo850 [250GB] or newer Evo860 ?

[0rangeC0astalGetaway]

So I know that an M.2 Solid State Drive is roughly 1500read + 1000write & is a lot faster than a normal SSD 500read + 500write
& I know that Samsung [Evo 850] has a newer 860 out ..but on Ebay there's an M2 Evo850 [250GB] in an enclosure with a USB3 connector
..So0o0 will an M.2SSD thru USB3 make it slower than a normal M2 thru a 1x PCI-X I would think so but I'm out of the PC loop.
any help is appreciated.. 0range.

 

[rgd1101]

m.2 have 2 type. pcie fast, and sata same as the 2.5".
EVO850 860 is sata type

 

[0rangeC0astalGetaway]

I think it will be the earlier version of M.2 ..but theactual question was 'Speed'
will it going thru USB3 be a lot slower than PCI-X-x1slot

 

[rgd1101]

https://en.wikipedia.org/wiki/USB#USB_3.x

PCI Express - Wikipedia

en.wikipedia.org

One in bit, one in byte

 

[popatim]

The M2 850 is a Sata drive and not a bit faster. The only difference is the drive uses the M2 connector instead of the normal Sata ports.

M2 can be configured in 3 ways by manufacturers. PCIE & Sata, PCIE only, or Sata Only. M2 is just the connector type.

 

[0rangeC0astalGetaway]

So USB 3.0 has a theoretical speed limit of 625MB/s, PCIE X1 is 250MB/s, USB 3.2,[Sep 2017] introduces two new SuperSpeed+ transfer modes over the USB-C connector with data rates of 10 and 20 Gbit/s (1.25 and 2.5 GB/s). The increase in bandwidth is a result of multi-lane operation over existing wires that were intended for flip-flop capabilities of the Type-C connector

So the oblong M2 SSD card within a USB3 enclosure ..in theory will be a lot faster?
So why don't We have Our Primary O.S. Drives connected by USB3?

 

[popatim]

You cannot exceed the speed of the slowest device in the chain.
That would be the M2 sata 85o Evo drive. It is not pciex1. It is Sata.
{I wasn't sure if you fully understood that by your last post. }