does an m.2 slot that shares bandwidth with a SATA 6.0 Gb/s port run at sata speeds

[david0n]

i want to get an m.2 ssd but according to pcpartpicker my motherboard m.2 slot shares bandwidth with sata, will this reduce the speed of my m.2 drive to the speed of a regular sata ssd?

 

[kraelic]

Read the manual to be sure, see if the m.2 supports both PCI express x4 and SATA modes. When using a SATA m.2 the boards usually redirect one SATA board connector to the m.2 slot.

Though I have seen a board that lost 2 sata ports on the board if you use either SATA or PCI express m.2

If you gave us the model of the motherboard we could help to see what it does.

 

[13thmonkey]

precisely which board do you have?

 

[david0n]

precisely which board do you have?

http://www.gigabyte.us/Motherboard/GA-B250M-DS3H-rev-10#kf

 

[13thmonkey]

third line down:

Ultra-Fast M.2 with PCIe Gen3 x4 & SATA interface

Storage Interface Chipset:
1 x M.2 connector (Socket 3, M key, type 2242/2260/2280 SATA and PCIe x4/x2 SSD support)
6 x SATA 6Gb/s connectors
* Refer to "1-7 Internal Connectors," for the installation notices for the M.2 and SATA connectors.

 

[kraelic]

Ok according to the manual, if you use a PCI express x4 m.2 it is 32Gbps Intel Optane or Samsung 960 Evo for example.
If you use a SATA m.2 like the Samsung 850 Evo, then the SATA 5 is disabled and routed to the m.2 at sata 3.0 speeds, SATA 0 -4 will still be available for HDD SSD DVD etc.

The two speeds share the interface, not the bandwidth. M.2 is a form factor not a speed reference you need to know which you are buying.

 

[13thmonkey]

Absolutely there are many types of M.2 look at the specs of what you are buying, some will be sata speeds, and some will be better.