Seems they never fixed it for the 7xx and perhaps other southbridge amd chipset boards. Found out the hard way when upgrading an older amd system with a readycache. You think you are doing some good by installing windows and adding amd sata ahci drivers, but it only makes the performances abysmal, so just use the windows 7 default microsoft driver for best performance.
This doesn’t apply to modern boards, they finally fixed it in later chipsets.
Just a heads up for anyone facing the same problem.
Esp since the catalyst chipset driver package on amd’s site will install those drivers, so don’t take the shortcut, use chipset drivers from the motherboard makers site,and justs skip the sata drivers. Amd’s pretty bad with drivers to the point where they put out a beta gpu driver which for no good reason came with broken chipset drivers which broke peoples ahci sata driver setup, leading to failure to boot issues. System breaking betas, there are threads on the trouble that caused…
Probably only applies to sata 3gbps boards.