Well this pc work with pfsense
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Lenovo tower Server - TS140
Intel Core i3-4150 Processor (3.50 GHz)
4.0GB RAM
Integrated HD Graphic
Intel Ethernet
DVD Recordable
500gb harddrive
pci card Intel Ethernet -
pFsense doesn't have an approved list of third party hardware, they sell their own, but it's widely known pFsense will install on generic PC wo much prob. So prob yes.
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It will work quite well actually. I'd skip that PCI NIC and get a PCIe NIC instead. You should be able to run GB with that so why hobble it with a PCI NIC?
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Are you dedicating your TS140 to pfSense, or are you going to virtualize? Just asking because I have a TS140 with the i3-4130. If you plan on running something like ESXi so you can use your TS140 as a server and a router, you might want to upgrade the processor to a Xeon - the 4130 only has a total of 4 threads available. For my uses that just isn't enough oomph, so I upgraded to a E3-1275V3.
Just something to consider if you will be doing more with your TS140 besides just routing packets.