With the limitations of the PCI bus, all current systems that rely on PCI adapters will not reach the maximum transfer rate of SATA2 or SATA3.

So you either accept the limitations of your hardware, or you upgrade.

Right now, an X5000 would be a costly upgrade compared to a Peg2 (considering the original price of the Peg2).

Here is where late 2005 G5 support would be nice. We could at least upgrade to an SATA2 controller.

An SATA3 driver might also be possible, depending on the transfer limitations of PCIe Gen1.