how much of my cpu is safe to use for background encoding?

Kyoko Sakura

Celestial Guide
i'm using freemake video converter to convert videos and BES to limit it to 50% of my CPU

specs:
-2.4 ghz
-1.87 GB ram
-128 MB gpu
-windows xp OS

yes I live in the stone age. anyway firefox and hexchat seem to be running fine with freemake using 50% of my CPU. how much more of my CPU is safe to dedicate to video encoding without making firefox and hexchat all freezy? i don't want to do trial and error because i don't want to freeze my computer and get frustrated and shut it off during encoding.
 
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