mobo with ata ?

well on newegg im looking at sli mobos and see only a couple with ata support, what exactly is this used for (harddrives i think)but wouldnt pci-e do the job or does it depend on the setup
 
ATA is for hard drives, as you said. PCI-E is for something totally different, its a different interface entirely. PCI-E is for graphics cards
 
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