You just need to download AMD chipset driver, go device manager and point and upgrade the driver to AMD SATA.
Then you can get your sustain I/O performance of > 100MB/s even on normal HDD.
When the driver sucks even if you put in SSD, I/O performance will still be nerfed by the wrong driver.
A lot of people don't understand that in computer performance is always limited by the weakest link.
You can either believe that branding is the cause of the slow performance or troubleshoot components and fix the weakest link.
Default image also missing AMD Radeon Driver utility recommend reformat and install drivers straight from AMD website