First off your "Venice" 3200+ can get it's core voltage pushed to about 1.55v. But you will generate more heat and shorten the life span of yer CPU. Now you will have to adjust the HTT up from 200 MHz to as far as it will go without having windows not boot up or not posting at all. I have noticed that you will not get past 245 to 250 MHz on air (250 is very edgy). Now some people will get lucky and go higher, but not by much more without some seriously exotic liquid cooling. Remember that it also has to do with the CPU you get. Some might get a "better" core than someone else even if they are both rated at 3200+ or 3500+ and that would help alot in the "overclocking". Now your Memory will be the bottle neck in this whole "overclocking" senario. You will have to set all your timings manually for it all to work together. Plus you will have to set the Muliplier (1-1, 2-1, 3-4, 5-4... etc) so that your Memory is working as close to 200Mhz (DDR400 MHz, half of that 200 MHz) as possible without going so far over 200 that the Mem craps out. Now the XMS memory that you are using has a timing of 2-2-2-5. It's Cas Latency is 2. You should set that to 2.5. It will make it more stable. Plus it should go a bit over the 200 MHz mark. Also it is rated at 2.75 volts, you have it at 2.6. Push it up to 2.7 volts. Get the most out of your memory or no matter how you tweak everything else the system will take a big poop.
Now my system has an Asus A8V Deluxe MoBo with an AMD 64 3500+ clawhammer core CPU. I am pushing it at 2.72 GHz with an Arctic Cooling Freezer 64. I had it at 2.74 GHz but it was having a hickup every once in a great while, so I had to back it off a touch. I'm pushin 1.65 volts through a 1.55 volt core and my HTT is at 247 MHz. I can run the Super Pi 1 Million calculation in 34.86 sec. which isn't half bad. My Mem timings are 2.5-3-3-8 (Corsair ValueSelect) but I am pushing the multiplier to as close to the 200 Mhz mark as I can (at 194.1 MHz). So my Memory is as efficient as possible without making it or my system unstable.
Look around the net and find as much info as you can on your Memory MoBo and CPU. See what you can tweak to get what you want, but don't get upset if you can only push it to 2.48 GHz. That's a good jump in clock speed and you have stability also (which is more important than raw speed). Now there is memory out there that is either manufactured by Corsair Micro or Crucial that is rated to 250 or 270 MHz (I don't remember which of those two speeds is the correct one) so you could in essence push your HTT to 250 or 270 and have your Memory mutiplier at 1-1 so the Mem would be running at the same bus speed as your CPU. Now that's fast.
Read through this thread (
http://forum.osnn.net/showthread.php?t=2510) and see what we have posted as to our AMD 64 CPUs and the overclocking we have done... or not done.
Remember, all these things have to work together. You can't just adjust one setting and get great results. It doesn't work that way, you have to go through the "trial and error" of setting things then going back and undoing those settings and adjusting them differently until you get as close to optimum as possible. Just remember, stability is the most important thing. Good luck.
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Also, get on Google and search for CPU-Z, download it and run it. Get some screen shots of the "CPU" tab, the "Memory" tab and the "SPD" tab. This way we can see the readings you are generating and we can give more educated suggestions.