Hi, (Mr. Lazyguy) I modded my pentium 4 chip, and i am very very very sure that I did it correct. as shown on that page. And no other pins are connected, just the 1st and the 2nd pin in the second row, when that (cut) side of the cpu points to the bottom left... Earlier my motherboard used to show a voltage of around 1.49 (constantly switching between 1.48, 1.49 and 1.5), Now the bios shows the voltage as 1.52 (switching between 1.5 and 1.52) So though it should have been 1.7, it isn't. BUT... I can now run my system very stable at 2667 mhz, which i earlier couldn't... Do you think the voltage is actually 1.7 and is misread or something by the bios? Or maybe the bios is only capable of showing voltages of around 1.5? (1.52 being maximum it can show)? I don't have a toll to monitor my cpu as I use linux, not windows...Do you know of any such tool for linux? thnks.

Rarely you get what is stated. It is the safety margin that the motherboard manufacturers put in. In addition, you have to have a good power supply that will provide accurate voltage I/O. I experience Asus and Abit boards provide closer to voltage input. I stated the lower voltage effect previously. I don't know much about Linux system. May be others can offer help.

I have an asus mobo (P4S333-VM) My +3.3V voltage is quite low (about 3.13V). Is this voltage responsible for the cpu VCORE voltage? Also, do you think I have successfuly overvolted my cpu?

Balram: Asus P4S333 has Vcore voltage adjustment and you don't have to modify the cpu. The 3.3V is not CPU voltage. P4 Northwood default voltage is 1.5 only. The 3.3 volt is PCI voltage. Asus has pretty good voltage I/O. Unless, the power supply is insufficient. You should double check in making sure the wire is not hanging out too much, use an ohm meter is ensure continuity. Your bios should read 1.62 to 1.70 range. Also, check that the 12 volts socket is firmly placed. You may have bumped it off when you removed your CPU (the Yellow/Black 4 pin socket). Good luck.