Hi!
Got a 8800gts 320 that makes 756/1674/1050 on 1.40/2.10 volt. Problem is, when raising clocks even a little, in riva from 756->783 (smallest step) benchmarks starts to crash. It's rock solid at 756MHz, full load ~35C on cold water. I've done the ovp/ocp mods described in an old thread here at XS, but doesn't help. Before mods the driver stopped responding, now the srcreen starts to flicker and eventually it will freeze. No change in max OC.
This is what I've done: Three 1k reistors in parallell with smd-caps,(supposedly the OCP mod) and pencil the resistor "70B" to about 4,7-4,8k from 5,2.
Tried up to 1.6 vgpu and pencil 70B down to 4.3k. No difference!
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