Bij Hardware Upgrade hebben ze een bekende CPU Overclocking online geschopt. Per processor hebben ze ook in een tabel gezet wat de aangeraden settings zijn. Lees de guide hier.
The PCI bus uses two kinds of basic divisors: 1/2 and 1/3; depending on the bus frequency used (66 or 100 Mhz) the PCI bus remains always within the specifications working at 33 MHz. This is the same for AGP bus, which works at 66 MHz as default, so it uses the 1 o 2/3 divisors depending on the bus frequency used both 66 Mhz or 100 MHz. The PCI bus can also use the ¼ divisor, making it possible to use the bus frequency of 33 MHz (so within the specifications) even when the bus frequency is of 133 MHz; the APG bus, instead, doesn’t allow to use the 1/2 divisor, so at 133 Mhz of bus, it works at about 89 MHz, higher than the specifications, that is 66 Mhz (at least up to the introduction of chipset officially supporting the bus frequency of 133 MHz). This implies many stability problems with AGP video cards at bus frequencies higher than 120 MHz. Generally, an increase of 10% of the working frequency of a specific bus, PCI o AGP, such as from 66 to 75 MHz, doesn’t cause stability problems for peripherals (video cards, controller and other) connected to it; higher increases, instead, such as from 66 to 83 MHz of bus, can cause stability problems with some peripherals; hard disks can cause many problems with PCI bus frequencies higher than 37.5 Mhz, with data loss and instability; one solution can be to reduce the Pio Mode of the disk to decrease the performance speed of the electronic part allowing it to support better the working frequency of the PCI bus other than specifications. With SCSI hard disks, the stability problems depend on the SCSI controller, which could not work correctly with a frequency of the bus it is connected to (generally PCI one) higher than the default one.
Increasing the bus frequency, the memory too works at an higher frequency than specs: it can be necessary to act on the memory parameters to make the overclock stable, of course if you increase the bus frequency (increasing only the multiplier the working frequency of the memory doesn’t change). To change the memory timings you need to enter the BIOS of the motherboard and act on the item of the Chipset Features Setup menu, or Chipset Setup, or Advanced Setup (the names change but generally they are always concerned with the chipset and the advanced settings) and change the parameters; remember that with higher numeric values correspond lower memory performance, that is more stability, and turning off an item you obtain the same results.