Will one INTEL PRO 1000 GT increase my thoughput?

[Cojo]

I'm currently running my pfsense on a via mini-itx board with dual nics.
I only have one pci slot available so my question is if just one INTEL PRO 1000 GT will increase my thoughput?
As it is now I have only a throughput around 60mbit on my 100mbit connection.

[Perry]

I run pfSense on a via ex1000eg board with a raiser card with two Intel pro 1000 GT

Traffic throughput test over the 2 giga nic
NETIO - Network Throughput Benchmark, Version 1.26
(C) 1997-2005 Kai Uwe Rommel

TCP connection established.
Packet size  1k bytes:  27822 KByte/s Tx,  23663 KByte/s Rx.
Packet size  2k bytes:  28700 KByte/s Tx,  22661 KByte/s Rx.
Packet size  4k bytes:  29594 KByte/s Tx,  26015 KByte/s Rx.
Packet size  8k bytes:  29878 KByte/s Tx,  24368 KByte/s Rx.
Packet size 16k bytes:  29908 KByte/s Tx,  28805 KByte/s Rx.
Packet size 32k bytes:  30264 KByte/s Tx,  27273 KByte/s Rx.
Done.

[cmb]

@Cojo:

I'm currently running my pfsense on a via mini-itx board with dual nics.
I only have one pci slot available so my question is if just one INTEL PRO 1000 GT will increase my thoughput?
As it is now I have only a throughput around 60mbit on my 100mbit connection.

It will to some extent, but not as much as replacing all the NICs. The Intel cards do more on the card and require less of the CPU. Since it sounds like you're maxing out the CPU, replacing one of the NICs will lower your CPU usage (or allow you to push more traffic before pegging the CPU). But not nearly as much as replacing both would.

I'm not sure exactly how much benefit this will provide since you can't replace both NICs, but it should have some measurable benefit. If you try it, let us know how much more you can get through the box after doing so.