Quote Originally Posted by d0z3rr View Post
I'd shoot for a Killer NIC. I heard they are pretty decent, but will run about $300.
Even if you're building a $5000 machine for multiboxing, there are more bang for the buck options than a $300 NIC with marginal gains. Each time I've seriously considered going for this card, there's a more productive way to spend money.. usually involving something like another display or RAID0 SSDs. MMORPGs especially don't benefit as well from the latency reduction provided by the Killer NIC. It's better suited for smaller dedicated server first person shooters where you'll actually notice a difference going from 80 to 60ms latency over WoW going from 150 to 130ms at best.
Already have a $5k machine? Use that $300 to watercool & overclock it. Lag in WoW is caused more from server overhead than anything than can be done on your side of the network.

Like mentioned before, the ONLY reason the Killer NIC would actually be useful for multiboxing is to prioritize Blizzard packets over torrents on that machine. I'd rather just use one of many old computers to torrent while keeping my main machine's network bandwidth available all for WoW.