"The difference between Duron and Athlon. Nothing. Absolutley Nothing"
Wrong. Absolutely WRONG! If you don't know the answer to the question, don't answer it!
The early Athlon (Tbird core) ran at either 100MHz (200FSB) or 133MHz (266FSB)...the early Duron (Spitfire core) ran at 100MHz (200FSB) only! There is also a Morgan core Duron that runs at 100MHz (200FSB) only. The early Athlon has 256k L2 cache. The Duron has only 64k L2 cache. The latest version on the Duron (Applebred core) runs at 133MHz (266FSB) but still has only has 64k L2 cache.
The Duron is a lower performance "budget" CPU. It is only available in the socket A.
We'd need to know the model number of your board, the info you provided doesn't help other than it tells us it's a Jetway. Try using CPUZ & check the mainboard tab:
1800+ @ 8.5 x 200MHz
768MB PC3200 2.5-3-3-7
Asus A9550GE/TD 128MB