Sony PCV-RX740 - Manuel (Page 28)

VAIO Computer System Reference Manual 14
Expansion Slots
There are five expansion slots (see “System Board” on page 47).
Expansion (slot No.1) is occupied by the fax/modem card. A V.90
compatible modem has two jacks (Telephone and Line).
*
Expansion (slot No. 2, 3, 4, and 5) are available for expansion.
* Your system has five expansion slots, however, only four slots are visible from the back panel.
Slot No. 5
Slot No. 4
Slot No. 3
Slot No. 1/2