I never found the COLOR of a slot to determine what it was or its capabilities.
As to the PCI question. You can never be sure about that. It's a BIOS issue. If the BIOS supports it, yes. If not, no.
I am not a Dell hardware historian but have found a lot of information about boards with google. But there are many dead boards out there due to that BAD CAPS plague. Some folk dive in and didn't know then proceeded to lose their mind and wallet.
Please move this to the appropriate board. I bought two used mobos complete with cpu, memory, and VRM. Only missing item was the APG video card, or so I thought. The APG slot on a DELL board is GREEN, same length as a PCI, set back from the rear. This board and a PRECISION 330, which seems to be identical, use a BROWN video slot I believe is called a PCI-E slot. I do not have a video card for that board. These board were said to be from a OPTIPLEX GX400, and a PRECISION 330. Yet I do not think the were by the presence of the longer video slot. Also they will NOT power on using the power board #3505D. Do these use the power board 88RXM? The power connector is the typical GRAY 16 pin 2 rows of 8. The 4600 and 4700 apparently use a smaller BLUE 6 0r 8 pin connector with the same longer video slot. These facts seem to be contradictory. Is it possible that these4 boards are a newer vintage? Can a PCI video card be used in a PCI-E slot> I have a pci video card coming and a 88RXM power board coming on the off chance that the 88 switch will power these boards, Than I will use the PCI card as opposed to the E card. I do not wish to buy a different card if a PCI card will work. It has in the past in an 8100 board. Please provide advice and guidence with specific names, models/part numbers web sites and explain this in terms I can understand. Perhaps these are not the board models I think they are. On EBAY I have seen these boards with both the GREEN and BROWN slots called the 4H665 optiplex gx400 board. Cannot be both. Can it? Revision?