i have the same problem with my Gigabyte M68MT-S2 (AM3+ MB) with nVidia nforce 630a/7025 chipset.
Only Sata 1 spec for Sandisk extrem 120 ssd …
So i update with the last nVidia SATA drivers = no results.
I update last Sandisk firmware (rev 2.01) = nothing change.
My WD HDD caviar green is faster and OK on SATA 2 spec…
So if Sandisk aren’t able to fix it quickly, i return the ssd for it’s bad performances
