Yeah, 70 degrees isn't the highest the CPU can handle, but yeah, you should be getting 50-60 degrees with the stock fans...It's pretty high.

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Specs: ASUS A7S333 mother board, AMD AthlonXP 2400+, 512MB PC2100 RAM, ATI Radeon 9800 Pro (128MB), Soundblaster Live! Value, 160GB Maxtor hdd