Originally Posted by l3gend.
all overclocking is done in the bios(or should be), reboot your machine, on POST screen press del or whatever button it says and the bios menu will show up. to overclock your vga card u need to increase the pcie freq and its voltage in the volt section of your mobo, its like when ur overclocking ur cpu. you need to increase both slowly and test with atitool or furmark or any other graphic stress tester. if its unstable increase the voltage or lower the freq.
No, all overclocking for the CPU, RAM and NB are best done within BIOS.
GPU's however are a different kettle of fish, wherein Software overclocking is best and generally safer.
The PCI-E Bus also includes the HDD Controller and other cards plugged in, raising the PCI-E frequency too high can cause data corruption.
In general, all it'd do is cause instabilities, and leave the voltage for the PCI-E Bus alone also.
MSI AfterBurner and EVGA Precision are the most easy to use overclocking tools, and come highly recommended these days.
Use OCCT, FurMark or GPUTool to test your card's stability. ATiTool will work well with your card too.
Read, read, read. Whatever card or Processor you have, look for similar overclocks or tutorials, there should be a good read in the Intel section to OC your Processor.
Always up in increments, if you see someone that has a massive overclock on their card, try a tad lower if you wanna try and reach a similar speed, not every card or Chip overclocks the same.