Ah, those were the kind of hard drive readings I was getting out of my Hack before I applied some kexts for the southbridge. Chances are that's where your performance bottleneck lies, and it won't matter if you're using IDE or SATA. Experience spoken for here.

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Custom Hackintosh...AMD Athlon X2 5000+ (2.6 GHz) on GA-MA78GM-S2H...Linksys WMP300n Wireless...ALC889a sound...ATI HD 3650 PCIe...1 GB DDR2 RAM...320GB Western Digital SATA + 200GB Seagate IDE HDD...Rosewill DVD-RW IDE...Running Kalyway upgraded to 10.5.7...All Fully Functional