Both are important, and they should both be near the same under load. A 4C diffference is completely normal. Ive seen a 8C differance before.
The annoyance of a dual core, is the back ground process can warm up a core at idle, makuing it look like things are amiss.
D/l prime95 or inteol burn test to stress your cpu to get an accurate 100% load number.
Download IntelBurnTest 2.53 Free - Stress your computer to find out how stable it is - Softpedia
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