@matguy:
That appears to be a Optiplex 520 DT motherboard, as shown here:
http://support.dell.com/support/edocs/systems/opgx520/en/ug/sdabout0.htm#wp1075336
As far as you're concerned, that's a pair of standard PCI slots. That longer one is made to function also with a riser card, which in some cases may provide a single or a pair of PCI slots (maybe a PCI-Express x1, I didn't fully research that) at a right angle to the motherboard, but functions as a standard PCI slot without the riser card.
Note, some PCI-X (not PCI-Express) cards may fit in the shorter, standard PCI slot, I would not try to fit a PCI-X card in the longer slot (nor PCI-Express, for that matter ;) )
Thanks very much for that info
All i see on the SFF is GX520.
I just bought an
PCI 3Com 3C905CX-TX-M 10/100 and ill let you know how i go. Intel chipset seems to work better with pfsense