NVmax is a significantly more powerful tool than Coolbits, so be careful and don't change things you don't know the purpose of. However, the key terms/options will be explained a little later, but I'll look at NVmax's overclocking first.
Overclocking with NVmax
There are a lot of other options in NVmax to fiddle with, but for now we will skip past them and focus on the Core/Memory overclocking part of the application. Once you have opened NVmax, go to the icon that looks like a pair of cogs, and select it. The first thing you will notice is the much larger range of frequencies NVmax offers. I can set my GeForce3 at 275/640MHz, which is obviously far past the limits of the card. Thus the extra frequencies NVmax offers are basically a waste of time, but I can set my card to around 510MHz memory, which is the maximum overclock obtainable without artifacts, and which was unattainable using Coolbits.
The overclocking with NVmax is just as easy as Coolbits. To change the speeds, simply move the slider corresponding to Core/Memory to the desired speed. A five second timer will then start, and if you have not clicked the mouse, the card frequencies will change to your setting. If you have moved the slider too far and can't get it to the right spot, clicking on the countdown message will reset to the previous value.
Another thing to note is the recommended frequency zone that NVmax gives. This is represented by a blue bar in the speed bars. You may as well ignore this, as my recommended memory speed is about 362-422MHz which is below and just above to the standard clock speed of the card. Unless you have a really low quality Ti200, you will easily be able to pass 422MHz on the memory. The same goes for the core recommendation, this time ranging from 145-188MHz.
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