Hey there,
I hope to see a response here too as I've been researching this same upgrade to no avail.
Re. temperatures
- You can monitor the temperatures of a number of different copmponents inside your Mac with "Temperature Monitor"
[http://www.bresink.com/osx/0TemperatureMonitor/history.html]
- You can also manually change the fan speeds if you can see your temperatures getting too high with "SMC Fan Control"
[http://www.macupdate.com/app/mac/23049/smcfancontrol]
This helped me when my 2133 would crash during COD4 matches. The GPU would overheat and freeze and could only be overcome with hard restarts. Manually increasing fan speeds before I start playing now means no dramas.
I'm sure these should work just as well for your new processor. That is, if you went through with the upgrade...