I have Windows XP through Boot Camp on my 15.4" MBP 2.2ghz, 4GB RAM, 128MB VC. I only have 10GB partitioned to Boot Camp so I have Steam installed on a 750GB External Hard Drive. CS and Portal run perfect coming from the Hard Drive but they both make the MBP run up to 80 degrees celsius. I also use SMC on OSX to bring the fan speed up 5K RPM and switch to Boot Camp to keep it running cool. But it still gets hot. As soon as I quit the heat goes down but Im worried about the heat during play. Anyone else experiencing this? Any Ideas or help on what to do?