I'd think the clocking procedure for AM2 should be similar to s939 clocking (I've done 939 clocking...so I might be able to help.)
I've downloaded the manual for your mobo, so here's a crash course on OCing (though I really would consider not clocking given your current temps, this may not be 100% accurate since I doubt the bios version for the manual is the same as your bios version)
Restart your computer and enter the bios (for my asus board, I press delete to enter the bios)
-go to the advanced tab
-go into JumperFree Configuration
-change CPU overclocking to manual
^this might open up more options for you...but I don't know since I don't have the board
-somewhere around the advanced tab you should find cpu frequency, increasing this is one part of overclocking. It's best to increase in small steps (1-2MHz is recommended but I find myself jumping in 5MHz increments until I get close to my final value)
-The frequency multiplier is multiplied with the cpu frequency to give you your actual clock (so 300MHz cpu and 9.0x multiplier gives you 2.7GHz)
increasing this increases your clock (if it's not already at its maximum)
-change dram timing mode and memory clock mode to manual
this should open up ram timings and the memory divider
-you can tighten the ram timings to increase performance somewhat
a higher memory divider makes the ram operate at a faster frequency
the most important ram timings are Tcl (CAS Latency), Trcd, Trp, Tras and the command rate (1T or 2T)
lower numbers = tighter timings
higher numbers = looser timings
I've read somewhere (couldn't tell you where though) that Tras should be at Trcd+Trp at a minimum
and that's the basics, now for some stability tips
-Increase the processor voltage if your overclock isn't stable (though you shouldn't exceed 1.5V)
*you need to be mindful of your temps, as more voltage = more heat
-Another thing you can try when you start increasing the cpu frequency is to increase the Northbridge voltage
-Hyper Transport Speed...I'm used to having an HTT multiplier, so I don't know how this affects stability, try keeping it at 1GHz (or if that doesn't work, lower it)
-If your OC isn't stable, try loosening your ram timings (going to 2T command rate might do the trick)
-If you want your ram timings to stay the same, increase the ram voltage a bit
-You can also lower the memory divider (ie, from 400MHz to 333MHz)
I don't really understand why this isn't just 1:1 or 5:6 etc...but your ram frequency should be cpu frequency * 2 * memory divider/400
(300MHz*2*533/400 = 800MHz)
the best way to do things is by only changing one setting at a time
if you go to the power tab and enter HW monitor configuration you can see your cpu temp (which is more reliable than things like coretemp and speedfan)