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Poor HDD Speeds after AHCI enabled in Bootcamp Windows 7

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I have a Mac Pro 3.1.
I have enabled AHCI in Windows 7 bootcamp using AHCI_enabler.
Had initial blinking cursor problems on startup after installing Intel Matrix Storage Manager V8.9. MBR may have been stuffed up by Parallels or PRAM reset, not sure which. Anyhow after much stuffing around trying to fix this I had to swap my Windows 7 install HDD to Bay 1 on my Mac Pro to be able to boot windows again.
Anyhow Intel Storage manager reports drives as Generation 2, however I am only getting around 3 mbps in Passmark benchmarks on my drives.
I thought I should be getting closer to 300mbps. I was actually getting better benchmarks before enabling AHCI.
Does this tweak only apply to SSD drives or should this apply to SATA2 drives as well?
Any thoughts?
My bad - I need to test an SSD Drive

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