My problem is that the SSD as advertised is supposed to be 300 mb/s read/230 mb/s write time and currently this is what I'm getting.
I switched into AHCI mode after installing my operating system because I forgot to switch from IDE to AHCI before I installed the OS. I know on my old computer when I switched into AHCI after being in IDE it gave me a success message after reboot saying it successfully switched whereas I never got that sort of message.
I've tried going to device manager and disabling the cache option and that didn't help.
Any ideas or do you think I should just reformat and make sure it's in AHCI before putting the OS back on?
Don't think that would make any difference, as I had it in IDE when I installed the os, then changed it to AHCI. I have an older chipset than you (P55) and I still get much higher scores. Think you should get it replaced tbh