Atempt to overclock and windows
- Thread starter ionicle_old
- Start date
ionicle_old
Banned
and this helps....how? :S
PCI (Peripheral Component Interconnect) or more properly, the PCI bus is what we are referring to. The PCI bus likes to hang around 33MHz. You can go higher. FSB overclocking on older motherboards almost always requires it. However, if you go too high you can get problems; your Sound Card can make noises it shouldn’t be, your Modem/Network cards can simply not work properly, and worst of all, your Hard Drive can corrupt all its data. A locked PCI bus is a feature of a motherboard which manages to always keep the PCI/AGP speed at 33 and 66MHz respectively. Ensure it is always enabled when overclocking, there is no penalty for using it. Many motherboards with this feature do not have an option in the BIOS to enable this- it is always on by default. Some motherboards may also allow you to lock the PCI/AGP speeds at a higher or lower than default frequency... this might be handy if you are trying to get the most throughput for your PCI devices (eg Hard Drives) for example, or for troubleshooting . Most people just leave it at default because there are no real benefits from increasing the PCI speed.
Note that some Athlon 64 motherboards have some issues with PCI bus locks. Additionally, the PCI lock on some motherboards seems to be broken at certain HTT speeds. There is an option in the BIOS to lock the AGP speed at 66MHz (and thus lock PCI at 33MHz) but this doesn’t seem to always be functional. For example, on some nForce3 boards, at 200MHz HTT on boot the AGP/PCI lock won’t be engaged, but the PCI speed will still be at 33MHz. If you overclock the HTT in Windows using Clockgen, the PCI bus speed will increase because it isn’t locked. However, if you set the BIOS to 201MHz HTT it appears that the lock does function, and if you overclock the HTT from within Windows, the PCI bus will remain at 33MHz. It would be wise to check your PCI bus is locked at 33MHz by making a small (eg 5MHz) HTT overclock and checking the PCI speed, before knocking the HTT up any significant amount.
Hope this helps mate
Note that some Athlon 64 motherboards have some issues with PCI bus locks. Additionally, the PCI lock on some motherboards seems to be broken at certain HTT speeds. There is an option in the BIOS to lock the AGP speed at 66MHz (and thus lock PCI at 33MHz) but this doesn’t seem to always be functional. For example, on some nForce3 boards, at 200MHz HTT on boot the AGP/PCI lock won’t be engaged, but the PCI speed will still be at 33MHz. If you overclock the HTT in Windows using Clockgen, the PCI bus speed will increase because it isn’t locked. However, if you set the BIOS to 201MHz HTT it appears that the lock does function, and if you overclock the HTT from within Windows, the PCI bus will remain at 33MHz. It would be wise to check your PCI bus is locked at 33MHz by making a small (eg 5MHz) HTT overclock and checking the PCI speed, before knocking the HTT up any significant amount.
Hope this helps mate
Also when the PCI Bus goes up, so does the AGP--like PV mentioned.
ATi Card's are known to be EXTREMELY SENSITIVE TO AGP BUS OVERCLOCKING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
Cannot stress that enough! You can just freak out teh card, or if you go high enough BREAK the card.
nVidia's aren't as sensitive. They can go to around 75Mhz AGP
ATi Card's are known to be EXTREMELY SENSITIVE TO AGP BUS OVERCLOCKING!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
Cannot stress that enough! You can just freak out teh card, or if you go high enough BREAK the card.
nVidia's aren't as sensitive. They can go to around 75Mhz AGP
ionicle_old
Banned
its usually the top one
ionicle_old
Banned
ok, but it makes sense that it would be the top one...
ionicle_old
Banned
thats mad lol
