想upgrade 張display card，但係又想keep 住張舊的...

soory you can't do that
your type of grahpics card cannot go in to SLi mode
you need a at lease 6 series or later card
you can also use a ATi'a X series to go on crossfire to use 2
display card at once

其實你張card係冇可能行到
你個張實在太廢
我估你都係行緊AGP
要PCI-E先行到2張card
不過2張card係指2張同系列既card
唔係咩card都得

you can not do that unless you have two mon la.