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Old 08-18-2010
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Default GTX 275 Lightning Vmods

Everywhere I've searched just describes BIOS/software hacks. That's great, but I prefer dynamic tactile control with screw turns.

The card uses uP6208 and the FB is simple to map with a nice solder point. Vmem is also straightforward.

OCP is available for modding with the IMAX2 pin and a 100K VR should work over the existing 36K resistance from pin to GND.

Here's my question. Is it reasonable to add a capacitor in series with the added OCP VR? If it is, how should I choose a capacitor value? 2.5V? Low or high uf?

This description of IMAX2 pin from the data sheet made me think of it:
Output current of IMAX2 is proportional to total load current. Connect a resistor between IMAX2 and GND then the voltage of IMAX2 is proportional to total load current. If IMAX2 voltage is higher than 1.2V, OCP will be triggered. Resistor between IMAX2 and GN?D can adjust OCP level. Capacitor between IMAX2 and GND can filter load current ripple to avoid OCP mis-trigger.
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