Dell OptiPlex 7050 SFF

Specs
I purchased this Dell OptiPlex 7050 via Ebay for around $60.00. It is a small form factor (SFF) desktop, with additional PCIe expansion slots, which made it a suitable alternative to other dedicated hardware these days for firewall appliances. The desktop specs were as follows:
Processor - Intel Core i5-7600T 3.50GHz
8 Gb DDR4 Ram 
500 Gb SSD 
Intel HD Graphics 630
The small form factor version of this desktop came with:
2x VGA ports
Optical Drive
1x USB-C port
4x USB 2.0 ports
2x DisplayPort
1x HDMI port
1x RJ45 ethernet port
The most important reason for selecting the SFF version was its capacity for PCIe expansion. Firewall appliances require 2 RJ45 ports, and these expansion slots allowed me to purchased a Network Interface Card (NIC) and install it on the motherboard. You can find more information about the NIC I purchased on the next page!

PCIe Expansion
As stated on the previous page, the SFF OptiPlex had the capacity to add an additional NIC to the motherboard. I purchased an Intel I350-T4 NIC, which is a quad port gigabit NIC. I purchased the card for around $40.00 off of Ebay, but it had a full server height bracket. Adapter brackets are available via Amazon for $7.00. Below you'll find the NIC after I attached the half-height bracket. 
Intel I350-T4 Network Interface Card
** There are many people selling fake versions of this card. Check out this link below to learn how to tell the difference between an OEM NIC and a fake!
Spot Counterfeit Gigabit NICs