Question Slow speed on brand new SSD

[nicholastan194]

Hi there, need some advice on my new SSD R/W speed as I'm very new to this. Recently I bought a brand new 1 TB Lexar NM790 into my current PC build as I'm running out of storage space. I did the purchase prior before understanding and knowing that my current B550M DS3H's 2nd M2 slot does not even support PCIE 4.0 NVME M2 slot. (Yup, pretty dumb). Told myself to suck it up and just install it, but after running a few test, I'm puzzled why is the Lexar NM790 only getting less than 2000mb/s on both read and write.

Existing PC Specs
AMD Ryzen 5600X
B550M DS3H
Slot 1 : AORUS NVMe Gen4 SSD 1TB (Boot drive)
Slot 2 : Lexar NM790 NVMe Gen 4 SSD 1TB ( NEW)


Based on the test i got from CrystaldiskMark, I'm only getting the below,

Read
1642 Mb/s
1536 Mb/s
260 Mb/s
70 Mb/s

Write
1615 Mb/s
1526 Mb/s
188 Mb/s
105 Mb/s

Is there anyone can help enlighten me? Why is this happening?

 

[kanewolf]

Hi there, need some advice on my new SSD R/W speed as I'm very new to this. Recently I bought a brand new 1 TB Lexar NM790 into my current PC build as I'm running out of storage space. I did the purchase prior before understanding and knowing that my current B550M DS3H's 2nd M2 slot does not even support PCIE 4.0 NVME M2 slot. (Yup, pretty dumb). Told myself to suck it up and just install it, but after running a few test, I'm puzzled why is the Lexar NM790 only getting less than 2000mb/s on both read and write.

Existing PC Specs
AMD Ryzen 5600X
B550M DS3H
Slot 1 : AORUS NVMe Gen4 SSD 1TB (Boot drive)
Slot 2 : Lexar NM790 NVMe Gen 4 SSD 1TB ( NEW)


Based on the test i got from CrystaldiskMark, I'm only getting the below,

Read
1642 Mb/s
1536 Mb/s
260 Mb/s
70 Mb/s

Write
1615 Mb/s
1526 Mb/s
188 Mb/s
105 Mb/s

Is there anyone can help enlighten me? Why is this happening?

The second M.2 slot is connected to the motherboard chipset. There is overhead that slows the transfers compared to the M.2 slot directly connected to the CPU.
Also if you look at the specs -- https://www.gigabyte.com/Motherboard/B550M-DS3H-rev-10-11-12-13/sp#sp That slot is only an X2 slot.
The drive is working as expected in an X2 slot.

 

[nicholastan194]

The second M.2 slot is connected to the motherboard chipset. There is overhead that slows the transfers compared to the M.2 slot directly connected to the CPU.
Also if you look at the specs -- https://www.gigabyte.com/Motherboard/B550M-DS3H-rev-10-11-12-13/sp#sp That slot is only an X2 slot.
The drive is working as expected in an X2 slot.

Right, thanks for the explanation!

Also, if I could ask, will it be better then if I were to swap the Lexar NM790 to the main slot that's connected to the CPU? As the Gigabyte SSD is only getting around 3500 R/W.

Thanks in advance!

 

[kanewolf]

Right, thanks for the explanation!

Also, if I could ask, will it be better then if I were to swap the Lexar NM790 to the main slot that's connected to the CPU? As the Gigabyte SSD is only getting around 3500 R/W.

Thanks in advance!

From a benchmark perspective, maybe. But why bother, you will never notice the difference. You aren't "missing" any real world performance. Is 1/2 second difference in game loads going to matter ?

 

[nicholastan194]

From a benchmark perspective, maybe. But why bother, you will never notice the difference. You aren't "missing" any real world performance. Is 1/2 second difference in game loads going to matter ?

Got it, thanks! Will leave it as it is then. Appreciate your help. 🙌