Evga nforce 750I overclocking core duo 2.8

I don't know what the rest of your configuration is, so here's my set of links and comments. Use what you need.

This should be your first stop.
HOWTO: Overclock C2Q (Quads) and C2D (Duals) - Guide v1.6.1
http://www.tomshardware.com/forum/ [...] uals-guide

This should be your second stop. You need to know something about thermal management or you can fry your CPU. It's actually kind of difficult to fry a modern CPU, but it is possible.
Core 2 Quad and Duo Temperature Guide
http://www.tomshardware.com/forum/ [...] ture-guide

Third stop will be a guide for your particular motherboard. Google is your friend.

You will need better cooling. Here are two under $50 heatsinks that are pretty popular:
Sunbeam
http://www.newegg.com/Product/Prod [...] 6835207004
Xigmatec Dark Knight
http://www.newegg.com/Product/Prod [...] 6835233029

They both require a somewhat different approach to applying thermal compound.
Suggestions for applying thermal compound:
http://benchmarkreviews.com/index. [...] mitstart=5

And they are pretty large, so they might not fit inside your case.

And here's a good budget cooler:
http://www.newegg.com/Product/Prod [...] 6835186134

Go through the first two threads. Do not do anything until you have a good idea about what you are trying to do. Once you have definite questions (you will, you will ), come back and ask.

Keep in mind that these are guides, not cookbooks. YMMV. Your Mileage May Vary. Because of all the variables, you may not do as well as someone else with a similar system. Or you might do better.
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Overclocking since 1978 - Z80 (TRS-80) from 1.77 MHz to 2.01 MHz