PCIe 3.0 x4 SSD and PCIe 2.0 x4 slot

[KsushaTeaKisa]

Hello everyone, I have an ASUS TUF GAMING B450M-PRO S motherboard with a Ryzen 5 5500. I know that my motherboard has 2 slots for m.2 SSD, I use the first slot for Samsung 980 500GB, and the second slot is empty. Will I be able to use a similar nvme SSD (also 3.0 x4) in the second slot or will it not work? I understand that the speed will be lower than advertised speed for the SSD (if it will be able for install), but it will still be faster than the sata SSD?

 

[ir_cow]

Yes

CPU:
1 x M.2_1 socket 3, with M Key, Type 2242/2260/2280
AMD B450 chipset :
1 x M.2_2 socket 3, with M key, type 2242/2260/2280/22110 storage devices support(PCIE 2.0 x4)*2
4 x SATA 6Gb/s port(s),

 

[Shou Miko]

The SSD should work because the M.2_2 slot supports both NVME and SATA but the speed will of cause be lower than the main M.2_1 port.

Another thing to note this: *2 M.2_2 shares bandwidth with PCIEX16_2. When M.2_2 runs, PCIEX16_2 will be disabled.

So if you use the PCIEX16_2 slot it's a no go.
@ir_cow you beat me to the punch

 

[KsushaTeaKisa]

The SSD should work because the M.2_2 slot supports both NVME and SATA but the speed will of cause be lower than the main M.2_1 port.

Another thing to note this: *2 M.2_2 shares bandwidth with PCIEX16_2. When M.2_2 runs, PCIEX16_2 will be disabled.

So if you use the PCIEX16_2 slot it's a no go.
@ir_cow you beat me to the punch

No, I only use PCIEX16_1 for the GPU

Thanks for the answer!

 

[LabRat 891]

NVMe drives are fully backwards and forwards compatible. They are PCIe devices, and negotiate maximum-supported link speeds.
In modern systems, as boot drives (or otherwise), as long as there's connection to PCIe, it will work.

Gen2 x4 is ~ Gen3 x2, and many Optane drives used Gen3 x2.
Without reseaching and quoting #s, it'll be fine and still MUCH faster than any SATA SSD

Spoiler: Warning: Tangential *and* Superfluous information ahead

Speaking to just how 'universal' NVMe drives are, even on 'ancient' machines they will work (with caveats)

As non-boot (storage, Page File, slog, cache, etc.) NVMe drives are a case of
"If it fits, it ships." Even Windows XP has a working driver for NVMe storage.

PCIexpress Generation doesn't matter, and Gen1.0x1 slots work just fine (w/ a very affordable adapter)

No screenies but, if you're determined enough you can even boot off of one on a PCIe Gen1.0 system.

Yes. Even on gen1x1, it's snappier than any SATA SSD, even if @ theoretically-lesser bandwidth.
NVMe, is a much more effcient and lower latency protocol vs. AHCI

 

[Shou Miko]

No, I only use PCIEX16_1 for the GPU

Thanks for the answer!

Your welcome and as @LabRat 891 says it won't run at full speed but still faster than a SATA SSD.

It's a good idea to fill out your System Specs a lot of people look at this too when someone asks for help.

 

[gurusmi]

1st answer in mind: RTFM
2nd answer: https://dlcdnets.asus.com/pub/ASUS/..._S_UM_v3_WEB.pdf?model=TUF GAMING B450M-PRO S
Page VII - Section Storage
1 * PCIe 3.0x4 & 1 * PCIe 2.0x4