**Disclaimer** Overclocking can possibly damage hardware if not done with care, and sometimes even when care has been taken. Guru3D, WildStyle or me (THunDA) will NOT be responsible for anything that might get damaged while overclocking. Since there seems to be a large increase of people upgrading to a64 rigs WildStyle and I (THunDA) have decided to write up a little guide to help everyone overclocking their A64 rigs. (THunDA can take full credit for this.. hehe) First we are gonna go over most of the basic settings that you will find in an A64 motherboard BIOS. It’s possible that different manufacturers might have things named differently, but they should be similar for the most part. If you are unsure of a setting then be sure to ask. After this we will explain how to find the max of each component separately which is the most important and overlooked part of overclocking. FSB/HTT Bus Frequency This is what most of us know as Front side bus ( FSB ) but now with a64’s it is called HyperTransport Bus Frequency ( HTT ).. LDT/FSB Frequency Ratio LDT is just like your CPU multiplier but it’s the multiplier that makes up your total HTT speed. Here is something I’ll quote from Wild that shows how to get your total HTT frequency.. **Important note** When overclocking you want to lower this setting to maintain stability. On a socket 754 its best to keep your total HTT speed around 1600htt or less, as Wild explains below this will not effect performance if running under spec a little.. On socket 939 its best to keep it around 2000htt.. Sometimes on 939 you can even get away with overclocking the HTT buss a little but honestly Ive never seen a performance boost by doing this.. CPU/FSB Frequency Ratio This is your CPU multiplier.. This times your HTT\FSB is how you get your CPU frequency.. **Important note** On all a64 systems it is not recommended to use half multipliers ( i.e. 8.5,9.5,10.5) because this will put your ram on a ratio which means it will be running slower then you think and not the same as you have your HTT\FSB set to no matter what.. A quote here from Wild shows what happens to your ram speed when using half multis… CPU VID StartUp Value This is the voltage that is applied to your cpu before the Vid and special are applied during post.. I havent found this to be a very important setting but normally I just leave it at 1.5v .. I also ran this using the Startup setting and it didnt seem to effect anything in a bad or good way.. So from my personal experience its not really a vital setting.. CPU VID Control This is your vcore which is your CPU’s voltage setting .. CPU VID Special Control This may be named different depending on the motherboard but it normally has options that look like this.. 104%, 110%, 113%, 123%, 126%, 133%, 136% What this does is let you add more vcore to your CPU when your regular vcore options are not enough.. What you do is multiply your CPU VID Control with your CPU VID Special Control to get your actual vcore. Here is an example of using the VID Special.. CPU VID Control = 1.50 CPU VID Special = 110% 1.50 x 110% = 1.65v So with this setting your giving your CPU 1.65 vcore. And for you lazy people check this out.. This says its for the DFI 250gb mobo but it will work for any mobo that lets you add % to the vcore.. Chipset Voltage Control This is the voltage applied to your motherboard chipset. The stock voltage for my chipset is 1.5v, but currently I’m running mine at 1.7v just to make sure its getting enough juice since it runs pretty cool for me anyway. I haven’t noticed much of an improvement in stability with upping this voltage as I did when I had a nforce2 motherboard but I like to up it a little anyways.