Overclock Pentium 4 531

August 6, 2010 at 16:33:25
Specs: Windows XP Corporate, Pentium 4 HT wth EMT64 @ 3.00 GHz, 1 Gb.
How would I go about overclocking a Pentium 4 531, 3.0 GHz.

I have DDR 400 ram, but the motherboard limits it to 233 MHz.

The motherboard is a Gigabyte GA-8I915PL-G revision 2.x with bios version F4.


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August 6, 2010 at 19:55:28
The P4 is a highly inefficient CPU. To help make up for that inefficiency, it's best to run the RAM frequency higher than the CPU frequency. The optimal CPU:DRAM ratio for an 800MHz FSB P4 is 3:4. So that means you *should* be running the RAM at 266MHz (533MHz DDR) even before you begin overclocking. Obviously that is impossible with your hardware configuration so you're going to have to make do as best you can.

Here's some settings to try:

C1E = disabled
CIA2 = disabled
CPU Host Clock Control = enabled
CPU Host Frequency = start at 210MHz, then increase in increments of 5MHz after that. Shoot for 240MHz.
PCI express Frequency = 100MHz
Memory Frequency For = 1.66

Other than that, you *may* have to increase the CPU voltage along the way to stabilize the overclock. Your safe voltage range is 1.200V-1.425V. If the system becomes unbootable, just use the ClearCMOS jumper to reset the BIOS, then start all over again.

If you can pull off the above, the CPU will run at 3.6GHz (15 x 240MHz) with a CPU:DRAM ratio of 6:5 & the RAM running at 200MHz frequency (400MHz DDR).

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