It depends on the PATA drive in question. That said, the fastest UDMA interface when used with an 80-wire cable is 133 MB/s. From there, the maximum transfer rate for a SATA generation 1 drive is 150 MB/s. For SATA 2, it is 300 MB/s. For SATA 3, it is 600 MB/s.
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SATA 300 has a data transfer rate of 300 MB/sec.
SATA 150 has a data transfer rate of 150 MB/sec
So I think the fastest you can get is the 300