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My SSD is underperforming

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I have a 240GB A400 Kingston SSD, that if you look at their website says that it should have 500 MB/s read and 350MB/s write speeds. But when I've benchmarked it with the userbenchmark benchmark, it's been in the bottom 1-5 percentile. I've swapped the SATA cable and it is definetly SATA 3, used different SATA ports on the motherboard. I have one of these drives for my laptop and it performs at the rated speeds, but I cannot figure out why this drive is so slow.

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1 minute ago, Darpyface said:

I have a 240GB A400 Kingston SSD, that if you look at their website says that it should have 500 MB/s read and 350MB/s write speeds. But when I've benchmarked it with the userbenchmark benchmark, it's been in the bottom 1-5 percentile. I've swapped the SATA cable and it is definetly SATA 3, used different SATA ports on the motherboard. I have one of these drives for my laptop and it performs at the rated speeds, but I cannot figure out why this drive is so slow.

If your SSD has a lot of data on it, lets say you only have 25 GB left, that might be the reason.

 

SSD can slow down up to 40-50% when they are 3/4 full

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It has 82GBs of space left on it, the test says that it only needs 30GBs to perform normally.

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I believe that is one of the QLC drives with a limited amount of SLC cache, so how fast it performs will depend on the file sizes.  Not sure if it has a DRAM cache on top of that, probably not being a budget drive.

Router:  Quotom-Q555G6-S05 running pfSense WiFi: Zyxel NWA210AX (1.44Gbit peak at 160Mhz 2x2 MIMO, ~900Mbit at 80Mhz)

Switches: Netgear MS510TXUP, Netgear MS510TXPP, Netgear GS110EMX
ISPs: Zen VDSL (~74Mbit) + VOXI 4G [Vodafone] (~120Mbit) + Three 5G (~500Mbit average)

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It is a TLC drive and on my laptop it's working at advertised speeds.

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Update: I've deleted some programs and now have 100GBs of free space, ran the test again and same result.

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Update 2: I've updated the BIOS for my motherboard and it has bumped the score upto the bottom 35 percentile.

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