[Overclocking] Intel Socket 478 Platform

Getting started

The modifications described below are dangerous for your hardware and stability of your system. Proceed to your own risk.
Better have a good cooling system(get rid of the default fan block/radiator coming with the processor and buy the right stuffs).

Bios

The options most frequently changed in the BIOS are:

CPU Ext.Clock (FSB)= the external bus frequency of the processor
DRAM Clock(FSB)= the RAM bus frequency
Clock CPU (or CPU Operating Speed) = CPU frequency
DRAM ratio = ratio between CPU and RAM
FSB DRAM = frequency of DRAM memory
Multiplier Factor = multiplier coefficient
CPU Vcore = processor voltage
DRAM Vcore = RAM voltage

(information based upon the model of motherboard ued)

Getting through

System configuration: Intel Pentium 4A at 2.4 GHz socket 478:

This processor uses a 100 MHz FSB and a multiplier coefficient of 24 by default.

To increase it to 3.2 GHz(3192 MHz):

Replace the RAM (DDR PC1600 at 100 MHz) by a strip of PC2100 DDR RAM at 133 MHz.

In the BIOS, modifiy:

CPU Ext.Clock (and DRAM Clock depending motherboards) to 133 MHz
DRAM RATIO : 1:1

Don’t forgetto settle AGP/PCI RATIO to(66 MHz/33 MHz) no futher.

If you do not have AGP/PCI RATIO Locked option, remove all these modifcations and stay to default setting.

Modifying the AGP/PCI RATIO Unlocked option, may damage the the AGP graphics card or PCI port or the PCI card.

Further Modifications

The frequency of your processor can be slightly increase. However these changes are for experts.

Material needed:



Aircooling system powerful enough (Coolermaster, Vantec, Zalman, etc ...)

Graphics (liquid cooling system that can reach below 40 degrees Celsius when processor is at full load).

Phase compressor that can reach temperatures up to -100 °C depending on the model and change

Xtrem-Cooling( E.g liquid nitrogen (LN2), which can reach 196 °C or reels of mixed helium reaching up to -270 °C.

A high end motherboard (ASUS P4C800-E Deluxe, Abit IC7-MAX3, Abit NF7-S, DFI Ultra Infinity, DFI Lan Party)

RAM with a high frequency (A-Data Vitesta, Corsair XMS, OCZ).

A good casing not too small.
A probe to check the temperature and software to operate it.


To increase the frequency is used in the BIOS:

Increase CPU Ext.Clock
Increase CPU Vcore if your processor cannot handle the increase in frequency
Increase DRAM Vcore
Putting DRAM RATIO 1:1
Lock AGP/PCI RATIO

Frequencies must be increased step by step, until the system is stable.