port multiplication? possible on a mac g3/g4? with the SY-PEX40045?

[supernova777]

http://www.sybausa.com/productInfo.php?iid=1142

im wondering if there would be anything like this that could work on a g4 mac..
to turn one Sata port into 2..

here it says: Supports PM Aware and Non-PM Aware Host
also Plug and Play. No Driver, No BIOS, and No Software Required for RAID Operation

http://www.sybausa.com/resource/SY-PEX40045/SY-PEX40045_Manual.pdf

SY-PEX40045
i saw this device listed for under $20

based on JMB322
http://www.hardwaresecrets.com/datasheets/JMB322.pdf

ok my mistake its listed as 27.99
http://www.newegg.com/Product/Product.aspx?Item=9SIA5B51ZR9391&cm_re=port_multiplier-_-9SIA5B51ZR9391-_-Product