definately use a NIC. Full duplex if supported.
Then go to <A HREF="http://www.dslreports.com" target="_new">http://www.dslreports.com</A>. Go to the tools page and run the speed test .
Then run the tweek test. Now set your settings as they suggest and run the speed test again. A little patience will get your best RWIN for your setup.
I aint signing nothing!!!