Sony PCV-RX550 - Manuel (Page 26)

VAIO Digital Studio System Reference Manual 14
Expansion Slots
There are three PCI slots, two of which are available for expansion (slot
No. 2 and slot No. 3).
PCI slot No. 1 is occupied by the fax/modem card. A Lucent modem has
two jacks (Line In and Phone), while an HPNA modem has one jack (Line
In).
There is one AGP slot (No. 4), which is occupied by an AGP card.
Slot No. 4 (AGP)
Slot No. 3 (PCI)
Slot No. 2 (PCI)
Slot No. 1 (PCI)