SSD not reaching full speeds, only 30mb/s write?

[70tostitos]

This is my SSD: https://www.amazon.com/ADATA-SU655-Internal-ASU655SS-120GT-C-Version/dp/B07DNLY1R2/ref=sr_1_1_sspa?ie=UTF8&qid=1540148940&sr=8-1-spons&keywords=adata+120gb+ssd&psc=1
I benchmarked it with crystaldiskmark, and my results are here: https://imgur.com/a/jNzYbRj
Obviously something is wrong.
What I can tell you is that the drive is a little over half full with an OS, and is going into a sata 2 port so I knew speeds would cap at 300mb/s. I *think* I have up-to-date mobo (Asus Commando) drivers, but which ones affect SSD speeds, so I can reinstall them? Do I need to update SSD firmware If so where, I can't find it for this model? Any BIOS settings I should be aware of?

 

[Barty1884]

SATA/Chipset drivers would impact things.

The fact you're connected to SATAII won't be doing you any favours, of course - but you're still seeing ridiculously low writes.

 

[70tostitos]

SATA/Chipset drivers would impact things.

The fact you're connected to SATAII won't be doing you any favours, of course - but you're still seeing ridiculously low writes.

I heard a firmware update might help? I can't find anything for this mode however.