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GeForce2 MX
The card is equipped with a voltage regulator by UNISEM, a microchip called US1150 (it is marked with an arrow on the picture below):
This microchip is responsible for controlling the power supply of GeForce2 MX chip. Its full name is "4A Ultra low dropout positive adjustable regulator". On the picture you can see a typical application scheme of US1150, which was taken from the datasheet:
The output voltage setting of the US1150 regulator, Vout, can be programmed to any voltages in the range of 1.25V to 5.5V with the addition of R1 and R2 external resistors according to the following formula:
The nominal Vcore of GeForce2 MX chip should be 2.05V.
According to our measurements, the Vout of the regulator was 1.92V, while the two resistors (R1 and R2, named R16 and R17 on the card) indicated 107.4Ohm and 56.9Ohm.
To increase the Vout, you may, for example, solder the resistor parallel to R1 (named R16 on the card), like we did (on the typical application scheme it is highlighted with red color):
This additional resistor provides 120Ohm. Now the total resistance of R1 makes 58Ohm and the Vout coming to the chip is 2.5V.
Samsung 5.5ns memory, which you see on the graphics card, receives the voltage of 3.3V according to Samsung web-site. This voltage goes directly via the AGP slot pins from the power supply unit or mainboard. Therefore, there aren't many opportunities for voltage adjustment here. So, the maximum you can set, 3.6V, is possible only if the mainboard allows changing the voltage (3.3/3.4/3.6V) with a jumper. We were lucky to have ASUS CUSL2 mainboard, which allows manipulations like that.
The jumper was set in the position to provide 3.6V that's why the graphics memory voltage made 3.69V.
As soon as everything was done, the end frequencies for the graphics card were equal to 265MHz chip and 210MHz memory.