Successfully overclocking DV2000

I opened up a T2050 HP Pavilion DV2000 to clean the dreaded fan/dust as shown in this during which I discovered the PLL used in these systems. It's a ICS954305EKLF PLL, with google telling me that Dell Inspiron 6400/9400/E1700 may use it as well. Since the machine was not mine I was not given permission to do any hardware mods to overclock it, though I did investigations on what would be needed to do it.

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Yohan cannot be BSEL pinmodded when used with a Intel chipset as shown here AND since the ICS954305E PLL cannot be programmed with sofware (setfsb/clockgen) the only way to overclock such systems is then to pinmod the PLL itself.

Suggestion on how to do this pictured above. Ensure if changing a pin logic from 0 (GND) to 1 (3.3V) or vice versa, that either the desired pin is lifted to separate it from the rest of the circuit OR a resistor is between the two sides of the logic. To connect a 0 (GND) to 1 (3.3V) would otherwise short the systemboard.

If jumping from say 533->667, your system will be running RAM at 333Mhz, yet still be using the 266Mhz timings. Consider using spdtool or Thaiphoonburner to *at the very least* change the CAS value to that used at 333Mhz, which is usually CAS=5. The other parameters can be modified on the fly using memset.

Further references: Overclocking other 64-PIN ICS TSOP PLLs, eg: ICS9LPRS355 and ICS9LPR501SGLF using PLL pinmod see this thread.