I hope you know that OC'ing will void that beatiful lifetime warranty. That PSU might not be able to handle it. If you OC too much, it might fry the card. It will cause your heat to go up. If you do overclock, I would make sure that other parts, especially the GPU, have great cooling. I've heard "rumours" about reducing the shelf-life of products, but I don't have solid evidence. What games are you playing that you want more FPS in? It'd be a better investment to get another 512 of memory, or upgrade the CPU, or even a bigger hard drive. Just my $.02.
I have a BFG GeForce 6200 (AGP) and it says it's overclocked, but http://www.digital-daily.com/video/peredelki/ says a GF6200 can be overclocked to 700mhz core clock.After looking at 6200's overclocking capabilities at various web cites I found a program, Riva Tuner(To download it just google it and you will find it fairly quickly), is said to overclock this card to the core clock speeds of a GF 6600. If used this program would I fry the graphics card, overheat the PC, Drastically decrease the shelflife of the video card, I've heard that's it's risky to overclock
My system info is if it is any help...
Intel P4 2.66ghz HT
512 Kingston PC3200 Ram
AGP 8x BFG GeForce 6200OC
300Watt power supply
1 40gb ATA HD
Win 98 OS