"Duron processors at 1Ghz"
I have used a Duron 1000 and a Duron 1200.
Both runned rather cold, 30-34 deg celcius with fan.
Performes bether than C3. And it is 686.
Worked quite OK, but It was SME 6.0.1 I used. Don't know if the SME 7.0 will require more power ..
The Duron Processor performs quite well, and it runs quite cold, but still I believe it needs a fan. .. But I belive that the Semperon will work even bether (but this I have not tried myself, until now ..)