I need a new rig but have been advised by IB tech support that xp 32 bit is still the recommended option (apparently no problems to run the TWS will be encountered versus vista or win 7). 32 bit means max of 4gb. So, here's the questions 1. what am I missing out on by running xp versus newer operating systems ? 2. my current rig has 2.5 gb of ram....so new upto 4gb.. doesnt seem to be much more (but only used for trading related ) ? 3. just does'nt seem to make sense to use xp on a new rig....? Any help/thoughts appreciated.