Nvidia 754 - Manual (Page 22)

Installation
Page 3-6
3-4 VGA Card Installation
Š To install a single VGA card in Single
Mode, insert the VGA into the "Primary"
VGA slot. (labeled on the board)
Š In Single mode the “Secondary” VGA
slot will become inactive.
Š To install the dual VGA card in SLI
Mode mode, insert into both "Primary"
and "Secondary" VGA slot.
Š When installing the VGA card, make
sure the card edge connector is fully
inserted into the slot and the clicker is
locked properly.
Important: Please read through the instruction below before you
start installing the VGA card.