ESATA Port Multiplier-Is it installed

I have 2007 Mac Pro. I recently installed an eSATA port.
It works fine with a single eSATA drive connected.
Just today, I purchased a Thermaltake: Blac X Duet
http://www.thermaltakeusa.com/Product.aspx?C=1346&ID=1895
On a notice included in the literature provided in the box, it states:
"This product requires the host computer to have PORT MULTIPLIER function on the eSATA port in order to recognize the multiple connected HDD."
Is this something built into the eSATA card or in the computer?
Is there an update that I can download?
The eSATA card is connected to an internal SATA port (as I'm sure everyone knows how they are connected).
Any info would be appreciated.

The built-in SATA ports do not support port multiplier. For that you need a PCI-e SATA card, such as:
<http://www.sonnettech.com/product/temposatae4p.html>

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