Question NVME's Gen5 and 4

[Geoff Leven]

Quick question about the Crucial T700

Crucial T700 2TB CT2000T700SSD3 PCIe Gen5 M.2 NVMe SSD - msy.com.au

Buy Crucial T700 2TB CT2000T700SSD3 PCIe Gen5 M.2 NVMe SSD - Buy Now, Pay Later + FREE pick-up & same day dispatch!

www.msy.com.au

This is my MB

Z790 GAMING X AX (rev. 1.x) Specification | Motherboard - GIGABYTE Global

Lasting Quality from GIGABYTE.GIGABYTE Ultra Durable™ motherboards bring together a unique blend of features and technologies that offer users the absolute ...

www.gigabyte.com

Now I understand that Gen5 SSD's will work in a Gen4 slot and visa versa, But will I be getting the advertised read/write speeds of:

Sequential Read: 12,400 MB/s
Sequential Write: 11,800 MB/s

if I plug this Gen5 SSD into the available Gen4 slot that my MB has?

 

[Maxxify]

Now I understand that Gen5 SSD's will work in a Gen4 slot and visa versa, But will I be getting the advertised read/write speeds of:

Sequential Read: 12,400 MB/s
Sequential Write: 11,800 MB/s

if I plug this Gen5 SSD into the available Gen4 slot that my MB has?

No.

 

[COLGeek]

Backward compatibility means working (generally) at the highest common speed between standards. In this scenario, at best, gen 4 speed levels.

 

[USAFRet]

Quick question about the Crucial T700

Crucial T700 2TB CT2000T700SSD3 PCIe Gen5 M.2 NVMe SSD - msy.com.au

Buy Crucial T700 2TB CT2000T700SSD3 PCIe Gen5 M.2 NVMe SSD - Buy Now, Pay Later + FREE pick-up & same day dispatch!

www.msy.com.au

This is my MB

Z790 GAMING X AX (rev. 1.x) Specification | Motherboard - GIGABYTE Global

Lasting Quality from GIGABYTE.GIGABYTE Ultra Durable™ motherboards bring together a unique blend of features and technologies that offer users the absolute ...

www.gigabyte.com

Now I understand that Gen5 SSD's will work in a Gen4 slot and visa versa, But will I be getting the advertised read/write speeds of:

Sequential Read: 12,400 MB/s
Sequential Write: 11,800 MB/s

if I plug this Gen5 SSD into the available Gen4 slot that my MB has?

Performance depends on the slowest device in the chain.

A Gen 25Uber drive in a Gen 3 port will only do Gen 3 speed.

The other half of the equation is....unless you are doing a large sequential copy between 2x similar drive, each in a 5.0 port...you will never notice any differene between 3.0 and 5.0.

 

[Geoff Leven]

Backward compatibility means working (generally) at the highest common speed between standards. In this scenario, at best, gen 4 speed levels.

Understood. Thanks for the speedy replies.

 

[LabRat 891]

I've been asking a (similar) question, and so far reviewers are not interested in testing.

All interface schemes have 'overhead'. Especially, with something like a Disk's Controller, it may have its own overhead or 'quirks' when in Gen4 or Gen3 Backwards-Compatibility.

What I want to know is, just how much performance difference there is between top-end Gen4-native NVME drives and Gen5-native drives in a Gen4 slot.
In other words: SN850X, P44 Pro, 980/990Pro, etc. vs. Gen5 SSDs in the same Gen4 test bench.

I'd also be interested in seeing Gen4 x1, x4, and Gen5 x1 comparative testing.
(though currently, no one is equipping x1 Gen5 slots, and Gen5 is even more sensitive to adapter-riser impedance)

 

[geofelt]

If your main use is benchmarking, gen 5 may be your thing. Gen 5 runs hot and may need cooling.
But, do not chase fast sequential benchmark performance at high queue depths.
Most of what we do is small random i/o, one at a time. Difference is not noticeable.
These guys could not tell he difference:

View: https://www.youtube.com/watch?v=4DKLA7w9eeA