I bought a new 4GB console a few months ago, just after Christmas. I use fiber optic internet with 75Mbps download/30Mbps upload. Ever since I got this new xbox, it never can figure out how to use the fast speeds. It should take about 2.5mins to download a 1GB file but my new xbox can't do that. It will download off live at about 5Mbps or less and the only way I can get it to work proper is if I start the download then reboot my xbox 2-7 or more times till it starts downloading at the proper rates. My old xbox worked fine on live but this new one sucks online. It tells me on REACH that I have poor upload, it's labled in red but my old xbox didn't do that. other games will randomly say or my xbox live tests will randomly say I have moderate or strict nat but if I reboot, sometimes it says nothing.
I have tried static IP's and I have tried leaving everything on automatic. Both giving same results. If I connect wirelessly instead of wired, I get instantly cut in half in speed, no matter what. This is supposed to have wireless N but it acts like wireless B and my router/modem is wireless N!
When I do a line test with my PS3, it reports back the appropriate speeds, but since PSN is crap, it never downloads at those speeds but my old xbox which I had since May 2006, pwnd those speeds with ease.
I just cannot for the life of me figure out why this new xbox never connects at proper speeds without many reboots.