sir try nyo po GUITAR RIG3 kaso kelangan nyo ng soundcard na hindi built-in o kaya external like yung USB interface ng BEHRINGER para hindi gaano maging issue ang latency.
It's good that you are getting good results from the Behri interface, but I want to clear up a few misconceptions muna.
You don't really need an external interface in order to run GR3 (or GR2, or Amplitube...). Internal or external will do as long as it fulfills the following:
a) it should have bulletproof drivers that allow you to run software like GR3 at the lowest latency possible. It doesn't matter if it's WDM (DirectX) driver or ASIO as long as the drivers allow you to process the signals at low latencies. Remember that uber low latencies in the area of 2, 3, or 4ms stress the cpu significantly, the same with higher sample rates; you may require powerful computers if you really need low latencies.
b) the interface should preferably have a high-z input to accommodate proper guitar impedances. While you can conceivably connect to a line input, you will experience tone suck. If your interface only has line level inputs, you can use a preamp/DI - I've used an ART preamp successfully (I liked what I heard but to be honest, I'm no guitarist).
c) the computer you are using MUST be optimized for audio. Disable devices you don't use like printer/serial ports, networking; don't use high-powered video cards - these have a nasty habit of stealing cpu headroom in insidious ways; disable TSR programs like virus scanners, spyware scanners, and chat (YM). These programs eat up precious cpu cycles that could be devote to processing audio. If you have to, create separate device profiles for everyday pc use and another strictly devoted for audio.
hth,