Turn off spread spectrum, and keep the "PCIe clock sync. to CPU" and "PCI clock sync. to CPU" disabled.
Then, find your Hyper-Transport configuration, and change it so that it's at 800MHz. Some allow you to change from like 1000Mhz, 800Mhz, 600Mhz...etc, or some have a divider. If you have a divider, put it at 4x.
Basically you want the HTT link to run as close to 1000MHz as you can, without it going over.
Intel Q9400 | Gigabyte EP45-UD3P | G.Skill 2x2GB DDR2 1000 | XFX HD5870
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