[SOLVED] M.2 SSD read-speed is still as advertised, but write-speeds have become significantly slower ?

[parama3500]

It's an Addlink S70 512GB, the day I bought it, I did a benchmark and it was fast, on par with the advertised speeds:

https://imgur.com/a/iTMjyuG

View: https://imgur.com/a/iTMjyuG

But today, 3 months later, the write speeds have decreased by five times:

https://imgur.com/a/CiAFCsA

View: https://imgur.com/a/CiAFCsA

View: https://imgur.com/a/I2bmWWm


What could have gone wrong? Any help appreciated

Specs:
Ryzen 5 3600 (Stock clocks but with a -0.125 Offset undervolted; cause of overheating)
1*8GB Corsair Vengeance LPX DRR4 3200 MHz CL16
MSI B450 Gaming Pro Carbon AC
ROG Strix GTX 1660 Ti
Addlink S70 512GB (Boot drive)
Samsung 860 EVO 500GB
Corsair CX650M PSU

Note: I'm running Windows 11 v22000.71
And speaking of the CPU undervolting, I have increased the negative offset since the day I bought the SSD

 

[rocktalkrock]

Have you run the Addlink SSD ToolBox software to check the health of your drive and for any firmware updates?

 

[parama3500]

Have you run the Addlink SSD ToolBox software to check the health of your drive and for any firmware updates?

Yeah, no firmware updates are found and it endurance is at 100%
This is the boot drive and so far I've never had any issue, or data loss, it even boots up within 15-18 seconds

 

[rocktalkrock]

Yeah, no firmware updates are found and it endurance is at 100%
This is the boot drive and so far I've never had any issue, or data loss, it even boots up within 15-18 seconds

The lack of free space on your boot drive may be your problem. CrystalDiskMark shows your boot drive is 89% full. Try clearing more free space on the drive [20 or 25% free] to see if write speeds increase.

 

[hotaru.hino]

Agree with @rocktalkrock , SSDs need a certain amount of free space for writes to work efficiently. Seeing how your drive has a capacity in a power of 2, the manufacturer likely didn't cordon off some of the storage so that it always has this free space.

If the write speeds increase after freeing up space, you may want to shrink the partition and leave the rest as unallocated, assuming the drive can use unallocated space for whatever it needs.