8800GTS 320MB, one of the cheapest Direct X 10 capable cards around, fresh
from oven. You want more overclocking headroom? A bit more voltage may help
would you think? Ok then let’s go.

8800GTS 320MB, one of the cheapest Direct X 10 capable cards around, fresh
from oven. You want more overclocking headroom? A bit more voltage may help
would you think? Ok then let’s go.

*Take Note that all physical Modifications Void your
warranty!*

First right at the back of the Graphics Card, you can measure the voltage of
the GPU core and the voltage of the GDDR3 Memory. Use your multimeter to measure
at the points marked below.

Default VGPU is 1.29v and default Memory voltage is 1.86v.

For Memory voltage, you can either choose to use a simple pencil
to increase the voltage or use a variable resistor to connect to the leg of
the IC chip shown below for more precise tuning.

You can pencil the resistor marked above carefully to increase GPU Memory Voltage,
or for better precision, you can solder a 20K ohms Variable Resistor to the
spot marked and hook the other leg to any grounded spot. Set VR at Maximum Resistance
and tune down resistance to increase voltage. Original resistance of resistor
is 538ohms, reducing resistance by 10ohms will increase voltage by 0.05v.

Unfortunately for GPU core voltage, due to the small resistance of the resistor,
it is quite impossible to tune voltage with a pencil mod. You will need to solder
a 500 ohms Variable Resistor to the spot marked and hook the other leg to any
grounded spot. Set VR at Maximum Resistance and tune down resistance to increase
voltage.

Ok, so you got this at your fingertips, simple stuff really, now just dump
plenty of cooling onto the card and I’m quite sure you will see a substantial
increase in overclocks. Eventually, this card is modified the exact same way
as the original 8800GTS 640MB.

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