Conclusion
After looking at the benchmarks, I'm not sure if there's any ambiguity when it comes to the performance of the Killer Xeno Pro versus an integrated Gigabit network card. But if you've skipped the article to check out the conclusion, I'll make it quick and simple: the $130 Killer Xeno Pro achieved results comparable to what a freeware Firefox plug-in offered, and that's during the load test. In the tests we did when we weren't congesting network bandwidth with multiple downloads, we experienced no notable difference in game latency and no significant advantage or disadvantage in frame rates when comparing the Killer Xeno Pro to an integrated gigabit network card.
Look, if you're having problems with game latency while downloading torrents, with FTP file downloads or uploads, and when streaming Internet radio, I think before anything else you should probably do yourself a favor and consider shutting those network-heavy applications off while gaming. It'll make your game play experience a whole lot smoother.
If you can't imagine pausing the Torrent swarm during your leisure time, uTorrent has a bandwidth-limiting feature built right in. As for Firefox, there's a free bandwidth-limiting plug-in that, as we demonstrated, will let your machine perform just as well as if you had paid money for the Killer Xeno Pro.

Indeed, there are other far more effective ways of spending $130 on your gaming experience. How about a nice gigabit-class wireless router with a QoS engine built in, which is also designed to prioritize gaming traffic? Not only does that give your games priority over the network, but it will offer the benefits of gigabit network performance and wireless draft-n as well. Or, aside from the network, imagine what a Radeon HD 4850 graphics card can do for you.
The difficult part for us here as hardware enthusiasts is that the Killer Zeno Pro has some very exciting specifications so I can't help but think it has a lot more potential. As we stated, it's essentially a Linux box with a 400 MHz CPU and 128 MB of RAM on a card. But impressive specifications and a laundry list of features don't necessarily translate into real-world performance boosts. Without the core ability to wow us with ultra-low network latencies compared to less expensive solutions (like a freeware Firefox plugin), configuring your torrent client, or simply turning off your downloads during your gaming session, the Killer Xeno Pro is a tough sell as a must-have gaming NIC.
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I think you may find that the utorrent test was "working" in the third test at the bottom of page 3 - Installation. Where it is "still charging along at about 100 KB/s total download speed". You should have chosen a smaller distro to test. The Killer Xeno Pro card maybe simply limiting each connected seed in the swarm down to 16Kbit/s. But you have 49 and 47 active seeds (respectively) for each Ubuntu torrent!! So 49x2kB/s=98kB/s maximum or 47x2kB/s=94kB/s maximum - so it could be working!!
You guys obviously have played around with iptables (optionally builtin to any newer Linux kernel) at all and it shows!! iptables has always had a bit of a problem with torrent bandwidth control. It is hard to aggregate each peer to peer link into one coherent "p-2-p" bundle as the TCP ports being used for the connections will be "practically" random!!
As for the Killer network cards - they are just a big joke. Do those guys not appreciate that the Linux kernel has inherent latencies of it's own - plus the PowerPC chip is only clocked at 400Mhz.
Doomed to fail IMHO...
Bob
I think most people who are using the on-board NIC that comes with a motherboard would benefit from something like the Intel EXPI9301CT PCI-E add in card, my upload and download speeds are much higher and more consistant. By far one of the best peices of computer equipment I ever purchased at any price, and all for 30 dollars.
Looks like it's just another piece of voodoo hardware, like $40 ceramic stands for power leads in audio systems. But hey, some people believe in flying spaghetti monster and if it makes them feel better - let them live.