You shouldn't need new RAM for this board, you should be able to get the thing working with that RAM. To avoid or fix stability issues with large modules, you pick your parts correctly or make system adjustments, or both.
1.) nForce3 250, nForce4, and SiS chipsets help stability a little.
2.) The Venice core Athlon 64 helps stability a little more
3.) Default voltage for PC3200 is 2.6v (there are some modules that want more)
4.) BIOS should detect the CPU core type, older cores will default the RAM to DDR333 for stability.
5.) The easiest ways to increase stability for an already assembled system are to raise the voltage, raise the timings, or lower the clock speed. Because the second two methods reduce performance, most people try raising the voltage first.
Now that you know all this, buy the board (it's a good one), pick a late-version Athlon 64, and if you have any stability or performance issues you know what to adjust.
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