the best way to reduce latency is connect directly to your modem with a wire, with no router, and have a decent cable provider that users fiber optic cable...
network cards a pointless if your motherboard already has a 10/100/1000 or faster Ethernet connection.
all these claims of lowering latency are just hype.
the reason they do manage to drop a few MS is that the software that comes with it optimizes your connection for the speed you have.
you can do the same for free and probably better.
basically you have bought a fair bit of dated or pointless hardware.
dont get me wrong its not a bad gaming setup but i would have gotten a different cpu/motherboard, a lower wattage psu and wouldn't have gotten the network card.