Welcome Redmist. I'm new here as well, but let me give you some options as well. When you say you're an old person (5+) I'm assuming 50+ years old (not 5+ years old, otherwise you're a child genius).
Is your graphics card a the MSI brand NX6800 by chance? MSI is the only vendor that makes the NX6800 card (which is just a glorified 6800 card as far as I can tell).
Now, before you go any further I think its only fair to tell you that overclocking your card and messing around with its internal settings will void your warranty. If you fry your card and the vendor doesn't replace it, don't cry to the SX guys.
Now that "cavaet overlock" being said, the good news about the 6800 is not just overclocking potential but 'unlocking' potential (which may actually be more beneficial than overclocking). The 6800 GPU is the exact same as the GPU on the more expensive and high end 6800GT and 6800Ultra cards. The only major difference is that the 6800 has 12 Pixel Pipelines and 4 Vertex Shaders while the 6800GT and 6800Ultra have 16 Pixel Piplelines and 5 Vertex Shaders. Now interestingly enough as the GPU's are identical those 4 missing Pixel Pipelines and 1 vertex shader aren't really missing....simply disabled. You can use RivaTuner to 'enable' these features. You can find RivaTuner on nVidia's own FTP site
ftp://download.nvidia.com/Windows/RIVA/. You can also use RivaTuner to change the clock and memory speed on your card (thereby avoiding Coolbits). Like FragTek said, run some benchmarking programs and see if anything 'odd' occurs (like weird graphics showing up....known as 'artifacts').
I'd suggest starting out by now overclocking, but opening up the 4 Pixel Pipelines and 1 Vertex shader and running 3dMark2003 and 3dMark2005. Its not really the score to care about...more that the test completes without artifacts. Don't feel bad if you end up with artifacts. From most posts I've read with people unlocking the pipes and vertex, most were only able to unlock 3 of the 4 pipelines (but were able to open the vertex shader). That's still quite the improvement.
Once you know the Pipes are stable, start playing with the clock speed and multiplier. Its not unheard of to get a 6800 card up to a 6800Ultra performance level.
Good luck and let us know the results. And if you fry your card....oops.
). Two friends of mine have already bought 6800's and did the unlocks (3 of the 4 Pipes) and 1 of the Shades.
