The fan on the Macbook doesn't have a proper intake so I highly suggest drilling holes in the bottom where the fan is. It's a pretty easy improvement and it really helped mine with the thermal throttling and now I can watch 1080p videos without it stuttering. To drill holes in it just open up the Macbook and remove the fan and drill a few holes from the inside out, then clean up all the shavings, and then put it back together. I also replaced the thermal paste on mine but it didn't help nearly as much as the holes so I wouldn't bother doing that unless you have some paste laying around.
That's a normal temperature for the Macbook 2,1. It does thermal throttle once it gets to 70C which is pretty easy to do on the 2,1.
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