am i doing it alright? (palomino overclocking)

I've got an AMD athlon xp 2000 + (palomino), and an Asus a7v8x mobo.
I'm currently using it at 1812 MHZ. the cpu frequency multiplier is 12.5, and i've upped the cpu external frequency (mhZ) to 145/36.
In WCPUID, it says that the system clock is 145mhz, and that the system bus is at 290 mhz ddr.
I haven't touched the cpu, i've got a thermaltake volcano 9 and cpu temp never rises over 45 degrees (~115 F).

Is it alright what i'm doing? i don;t really want to take it any higher, i don't want to stress any parts.I have got a samsung 512 pc 3200 (400mhz) ddr. Should i put it to auto frequency or should i let my cpu external frequency setting (145/36) overclock it?

thanks for your help!!, i'm quite new at overclocking.