Very few games need high-speed connections. Most of them just benefit from a low-latency connection. There is a link between bandwidth and latency but it's a pretty minor one. Noise on the line can drag down latency through lost packets and of course if it's so bad as to disconnect it will upset just about any gaming server.
But overall most games will run fine on a 512kb connection. Some of the MMORPGs will run adequately on a modem. I know several people that have played Eve-Online over modems when away from home. You wouldn't want to take part in a major fleet battle but you can do most things.
So overall as a gamer myself I would suggest you let BT's systems increase your noise margin to get you stability. In fact I did exactly that when I joined Be. I was getting two or three drops over the course of an evening so I asked them to bump me from 6db to 9db. My sync dropped from 13.4 to 12.5 and my connection has been great ever since.
Andrue Cope
[Brackley, UK]
Edited by Andrue (Tue 18-Dec-07 15:12:34)