So that you can determine if your system is running within the recommended heat ranges. The more heat the products sustain commonly the shorter the lifespan. Also, severe overheating could cause sudden pc shutdowns/instability etc.
With a decent flowing case and no overclocking it is rarely an issue.
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Rig#1:
OS: XP Pro Sp3
CPU:Intel Quad Core Q6600 (2.40ghz)
MB evga 750i
HDD:250 gb 7200rpm
RAM:2gb Kingston DDR2 667
GPU:EVGA 8600gts DDR3 256mb
PSU:Apevia 500w
Rig#2: Windows XP-Pentium 4HT 3.29ghz-160gb -2gb DDR2 667- EVGA 8600gt 512mb
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