It may not be the CPU. Here's why.
You are now cooling the entire machine. But let me ramble a bit about a few items and then note possibilities and what I might do.
1. Durons run hot.
Not much we can do, but that CPU HSF you have may be OK if not coated with dust and the fan is spinning proper. As a rule of thumb, I like the following. For the Duron, if it's not listed on the CPU/HSF, then double the CPU clock rate of the Duron rating. YOU HAVE THIS covered.
2. Dust, fans.
You don't need to go overboard, but if there is a lint layer on the heatsink then you take the lint off and that helps. There are other heatsinks to look at on the motherboard and graphics card.
3. Some other part may be heat sensitive.
Some find it's the motherboard, some the video card. It's not fun to find it.
4. Cooling the case.
Adding fans rarely cures this. I find that sitting back and eyeballing the case to see if we can remove a metal breakout on the front where some CDRW may go will give some extra airflow and if that's not enough we can put a fan in the side cover to take air in or out of the CPU, motherboard chipset or graphic card area which now produce many Watts.
A cool trick (pun intended) is a fan at the very top of the case to exhaust hot air from the top. This may require the case to have the space for such and some lightwieght metal work, but it's been a good case mod.
5. Leave the case cover off.
But now move that fan out of the equation. If it still works then it's just too hot overall in the case.
In closing, it's not just the CPU that needs cooling...
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