My previous system was also an A64 3200+. I had a Winchester core. Get CPU-Z to verify which core you have. I'm assuming it's a Venice...which is even better.
What I like to do for overclocking is to first test the limits of your memory. Start by setting a pretty generous Vcore like 1.5 to 1.6, Then, with the rated Vdimm and timings, keep pushing your HTT until the memory no longer works or is unstable. Run a round of SuperPI 1M to quickly test if your memory can even handle that. If it can't, then the overclock is extremely unstable. Then loosen the timings or increase voltage a little, and keep increasing the HTT. Keep doing this until you hit a wall with the memory, which means no matter how loose the timings or how many volts you put in, it will not go any higher. Keep track of the different HTTs that required looser timings or more voltage.
After you get a rough idea of what your memory limit is, set everything back to stock. Slowly increment your HTT with the stock voltage. The increment size depends on your memory limit. i.e. If your memory is only capable of around 230 MHz, go in small increments such as 2 or 3. Chances are your CPU is capable of much higher clock speeds than your memory, so if you want you can put the memory on a divider right from the start if your memory has a low limit. This way you know the memory is stable and any instability is a result of your CPU overclock. I recommend the 6:5 divider.
After every few increments where you're still able to POST and boot into your OS, run some stress testing. I suggest Prime95. See if it makes an error or your system crashes within the first 10 minutes or so. If it does, go back and increase your Vcore (assuming your memory started on a divider and is running below specs). Keep repeating this until you can run Prime95 for a solid 10 minutes. Once you find an overclock like that, keep running Prime95 for a couple hours. The general consensus is that 12 hours of stable Prine95 indicates a stable system. It's pretty time consuming so have something else to do while your computer is Priming.
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