E2, E4 & E6 Series FSB Mods

Overall Score

Overclocking of yesteryear was something of a true art. A science where you best friend was a number two pencil and you made frequent use of liquid trace pen and a soldering iron. Seems like so long ago right? Now overclocking is almost a hands off process, being able to be done in the BIOS or even the OS.

But now in an era when even Dell is shipping “Hyperclocked” XPS boxes and what was once a niche hobby has become a huge billion dollar industry, it seems there are still those left out in the dark. For those with boards that aren’t to overclocking friendly or that just won’t overclock at all, there is help.

Here’s a tip for those with the E4300 or any other Conroe or Allendale chip, such as the E2200 or E6400. These mods even work on the LGA771 Xeon processors.


Be aware that this mod will void your warranty like no ones business, especially if you aren’t precise in you work. Before attempting this, make sure you have the orientation of the chip correct, and you know which pins you are connecting.


Intel LGA775/771 CPU
Electrical Tape
Electrical Trace Pen / Conductive Ink
Sharp knife
Optional: Magnifying Glass

Location of the BSEL pads:

The Mod Work:

(L = Low resistance or a grounded pad)
(H = High resistance or an insulated pad)

For 533Mhz FSB, the pad coordinates would be H-L-L, where BSEL0 = Insulated [H], BSEL1 = Low resistance [L] and BSEL2 also is [L].

For the 800Mhz FSB mod (L-H-L), all you have to do is create an area of high [H] resistance on BSEL1. **See starred notation**

To perform the 1066MHz modification, BSEL1 would need to be grounded. This is performed by connecting BSEL1 and BSEL2, leaving BSEL0 untouched at its standard resistance.

**To create high resistance, cut a small piece of electrical tape (approximately 1mm x 1mm) and attach it to the pad that you want to create high resistance on.

Alternative Modification:

This mod will take the E4300 and raise the FSB from 200 to 266 (taking you from a 800MHz to 1066Mhz strap).

Connecting BSEL1 to VSS as shown in the picture, increases the strap and thus higher FSB clocks. Use the conductive pen to do this.

Important Notes:

1. This mod will force the CPU to do 2.4GHz at stock voltage. Thats a 33% overclock, and while most e4300s will cope with this, some may not. Your solution would be to combine this mod with a vCore pad mod. You can find these @ VR-Zone.

2. This mod will make your e4300 run at 1.6GHz under Speedstep rather than 1.2GHz. This isn’t really an issue, but note that any vCore mods and Speedstep tend not to get along. If you have volt modded you E series chip, disable C1E and EIST in your BIOS if possible.

3. The BSEL-VSS mod isn’t fool proof. Some motherboards don’t determine the processor speed by the BSEL, but by the CPUID. For these boards, the mod may not work. This is common in low end Asus boards.

4. Aftermarket heatsinks may apply to much pressure, and cause the pin on the motherboard to go through the conductive ink. If this is the case, try switching to the stock Intel heatsink or releasing some of the tension of the socket plugs.

5. Most importantly, always update your BIOS to the latest version stable before performing the mod.


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