Advice: Sell it and get an Athlon 64 3500+ while it is still worth something and before more people catch on to the following.
Similar clock speeds
Similar amount of cache
However:
http://www23.tomshardware.com/cpu.html?modelx=33&model1=246&chart=68&model2=269
Q) Are you going to get that +38% performance by overclocking a Socket A processor to over 3 GHz ?
A) I highly doubt it.
Sorry to burst the bubble, I like overclocking + testing for ages too, but when it is more cost effective to do otherwise...
At least your RAM, HDD, etc could be ported to new platform.
The longer you wait, the less it is worth.
If you're smart for $1/day you can have bleeding edge hardware using my simple four step process.
(1) buy hardware, start saving $1/day,
(2) keep hardware for 9-18 months,
(3) sell before devalued to far, say -40% on original price,
(4) reinvest sales revenue on said ('not so old') hardware
plus the $1/day savings (over 9-18 month period) into new hardware,
* - Repeat process until you're system specs can't get any higher or no requirement to upgrade for a longer term period.