overclocking 8800gts 640mb!

Okay so I want to overclock my 8800gts 640mb with nvidia performance control panel. I have my:
-Core Clock: 600mhz
-Shader Clock: 1406mhz
-Memory Clock: 904mhz

I am new and it seems like when I make shader or core higher, it doesn't pass the test thing. Which clock should i increase and decrease for best performance from my overclocked card.
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More about overclocking 8800gts 640mb
  1. Just try each one separately and see which one allows you to go higher.

    Overclock involves a lot of trial and error since not all chips are made perfectly the same.
  2. Dont OC buy Ntune,OC with RIVATUNER,its alot better

    Download link:

    A very good guide:
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