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After a little research, we found that the Intel RST 3.0.0.112 Enterprise storage drivers packaged by motherboard vendors with its INF 9.2.3.1020 chipset drivers are to blame for the lost performance. While enterprise-class drivers are likely optimized for data protection rather than maximum performance, users who want to extract the highest possible performance from the X79 Express can trick Windows into using Z68 drivers (Intel’s installer will recognize the different hardware and halt).
But Intel's RST drivers aren’t even required for the X79’s basic drive operation. A big performance boost in our overclocked configuration’s SATA performance comes from reverting to Windows 7’s generic AHCI 1.0 Serial ATA Controller driver.
The article states quite clearly ( emphasis added ):A 5900 RPM hard drive??
Now that the price of high-capacity drives is tumbling back towards what we were used to last year, we were able to get a 1.5 TB unit for only $100. We weren't able to secure that amount of storage space from a high-performance model, though.
Instead we ordered Seagate’s low-energy, 5900 RPM green drive. This is the repository we’d use to store photos, movies, and other things that don’t get moved much. Lower noise should accompany the slower spindle speed and stepped-back power consumption. All of that is fine; performance isn’t a big priority for the type of files we want to store here, and we already have that 240 GB SSD to help hold speed-sensitive apps.