How do I know how to set memory clock when overclocking?

So i have Sapphire 5770 and i want to oc it.
In MSI afterburner my defaults are: core clock 850MHz and memory clock 1200MHz (dont have shader clock). C-clock can go up to 960MHz and M-clock up to 1445. What is the best MHz for overclocking and how to know how much should i increase mem clock?
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  1. Best answer
    Trial and error, take them up a bit at a time and test, then a bit more (either individually or together, I prefer individually) and monitor temps as you go GPU Temp is a good free app
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