Hi there, just had a look at the specs of the Dell Precision 380 work station. it lists the graphics cards as NVidia Quadra FX or ATI Fire GL PCI-e (pci express.
These cards would normally have either 16 pin Dsub or DVI connections so shouldn't be different than normal.
If you have the Dell code you could look the actual unit up on the Dell site.
I see you mention a 9 pin converter, 9 pins is normally a serial connector not a VGA output to a monitor. Have you taken the side of the unit to see which graphics card is installed?