The Optiplex is required to connect to three networks so we need to add two additional Network Interface Cards. It has PCI slots vacant so would getting two network cards at http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&s=fed&cs=16&sku=430-5088&mfgpid=226254
work?

The machine can support only 8GB maximum RAM from http://www.dell.com/downloads/global/products/optix/en/optiplex_3010_technical_guidebook.pdf#page=11

Does anything else need to be changed when the motherboard is supporting 3 NICs?