Stability is
not fine. If it were, you wouldn't be blue screening.
System specs - especially motherboard and RAM?
My Core2 OC links:
This should be your first stop.
HOWTO: Overclock C2Q (Quads) and C2D (Duals) - Guide v1.6.1
http://www.tomshardware.com/forum/240001-29-howto-overclock-quads-duals-guide
This should be your second stop. You need to know something about thermal management or you can fry your CPU. It's pretty difficult to fry a modern CPU, but it is possible.
Core 2 Quad and Duo Temperature Guide
http://www.tomshardware.com/forum/221745-29-sticky-core-core-temperature-guide
Third stop will be a guide for your particular motherboard. Google is your friend.
If you have a Gigabyte 975 - P45 board (the BIOS's are all similar), this may be useful:
Shadow's Gigabyte motherboard OC guide:
http://www.tomshardware.co.uk/forum/page-245679_11_0.html
You will need better cooling. Here are two under $50 heatsinks that are pretty popular:
Sunbeam
http://www.newegg.com/Product/Product.aspx?Item=N82E16835207004
Xigmatec Dark Knight
http://www.newegg.com/Product/Product.aspx?Item=N82E16835233029
They both require a somewhat different approach to applying thermal compound.
Suggestions for applying thermal compound:
http://benchmarkreviews.com/index.php?option=com_content&task=view&id=170&Itemid=1&limit=1&limitstart=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/Product.aspx?Item=N82E16835186134
If you are getting a memory dump error, you may be trying to OC the memory. I don't think that's a good idea for a Core2 system. Run the memory at 1:1. The BIOS should have a memory clock multiplier (or something like it). Take it off AUTO and change it to 2.00. That way, the memory clock will always be twice the FSB freq.
We discuss memory overclocking in this thread:
http://www.tomshardware.com/forum/251715-29-ratio-myth
This will hopefully go a long way to solving your problems.
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