What Ports am I seeing here

[Notconnected]

Opened up an 2017 Dell Optiplex 7010.
Wondering if anyone can determine what the blue and the white and the black ports are.
I want to buy a network card for this computer so need to know the connection type.
I think they are Pci, but not sure if the colors relate to the generation or speed of them.
I don't want to go buying a 2.5G network card if the ports shown are going to be too slow
for the card to run at full speed or there abouts.
It is not the best of an image but had no light to make it clearer.
Am hoping someone familiar with these ports will recognise them.

 

[Tech9]

Dell Optiplex 7010

Here:

https://i.dell.com/sites/doccontent/business/smb/merchandizing/en/Documents/OptiPlex_7010_Technical_Guidebook_1.pdf

 

[Notconnected]

Good info there, still not sure which is the fastest slot, No13 states PCI-e x16 (wire x4) Connector (SLOT4) am not sure what wire x4 means.
Slot No1 states PCI-e x16X Which one is faster, will both slots take the same card.

Here:

https://i.dell.com/sites/doccontent/business/smb/merchandizing/en/Documents/OptiPlex_7010_Technical_Guidebook_1.pdf

 

[Tech9]

not sure which is the fastest slot

Most 2.5GbE network cards use PCI Express (PCIe) x1 slot and look like this:

PCIe x16 slots are backward compatible to x1-x8 cards, use any available slot.

 

[degrub]

The PCIe x"number" is the number of lanes of the bus that the card can use and how many are available on the motherboard connector. So -x16 means all 16 lanes are available to a card. If you match with a x16 card ( video cards for example) then it will be able to use the full bandwidth.
A PCIe-x1 card only needs one lane, so you can put it in any PCIe slot and it will work. The motherboard connectors that are closest to the CPU will have slightly better average bandwidth ( not theoretical) in practical use. This is why the video card is usually placed in a x16 slot closest to the CPU. You also have to look at the hardware interupts assigned to each motherboard connector to see which had priority or is shared with another slot.