Probably about 45 maybe....

Thats with a manual overclock right? I want to learn to overclock myself.

http://www.pcstats.com/artvnl.cfm?articleID=1966

Any simple guides for noobs?

Oh, also, a chart of ddr2 memory frequencies based on multipliers and dividers...
http://www.xtremesystems.org/forum [...] p?t=105798

On an AM2 system, your end processor speed is a factor of the following:
Reference Speed (many call this the FSB, but AMD CPUs no longer have one) * multiplier
Example: AMD x2 3800 @ 2.0ghz == 200mhz Base Speed * 10x Multiplier

The easiest way to overclock is to increase either your Reference Speed or your multiplier. However, most CPU multipliers are hard-locked, so the only real way left is to increase the Reference Speed.

To begin with, choose a speed you want to attain. For an x2 3800+, lets say 2.5ghz. The x2 3800+ comes with a locked multiplier of 10. So, to get 2.5ghz you have to reverse engineer your reference frequency by dividing your desired speed by your stock multiplier.

so... 2500 / 10 = 250

To get 2.5ghz out of your 3800 you would have to raise your Reference Speed to 250.

But other things will rear their ugly heads at this point.

1) Memory Speed is the result of Reference Speed * The memory divider, at 250 you must lower this

2) Hypertransport is the result of Reference Speed * 5, you will need to lower this too

3) As Processor speed increases, it requires more voltage, possibly between 1.375 - 1.400

4) As Memory speed increasaes, it requires more voltage, but not if you change the divider

The links I posed should help you out with that.

CPUs with half or odd multipliers are the easiest to overlcock. The reason being that the way AMD memory dividers work, the final memory frequency is always less than ddr2-800. This makes it real easy to OC these chips as you simply raise the Reference Frequency to the point where the final ddr2 speed will equal 800. For example, X2 6000+ @ 3ghz is 200mhz * 15. Raise base frequency to 214, 214 * 15 = 3.21 ghz.