Really, no tweak should be needed at all in order to get surpass the previous 4Mbps connection speed so I'd be a bit skeptical. Regardless, you may want to try out the free program TweakVI, which boasts internet connection tweaks in its repertoire. I haven't tested it myself yet but hope to get around to it soon.
Care to be the guinea pig?
My ISP recently increased the download bandwidth from 4Mb to 7Mb. However, my average bandwidth down remains at approx. 4Mb!
I ran some tests and spoke to Cox Cable, my ISP, and was told to increase my recieve buffer size in the registry. They all knew how to do it in Windows XP, but the instructions do not work for Vista RC2 32bit. I am running Vista RC2 x86 and my machine meets all requirements for Vista premium. Anyone know how to increse the receive buffer size in this OS?