|The short yellow one is PCI-E x1.|
The long yellow one is PCI-E x16.
And the yellow one that is a little longer than the x1 is an PCI-E x4.
You need to get a PCI-E x16/ 2.0/2.1 graphics card
What is the wattage of your power supply, it will say on the sticker on the power supply.
I am a hardware guy not a software guy but i try to help.