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high pitched noise "is standard" on cards made with cheap crap components unfortunately
Use MSI afterburner and try adjusting the fan speed too. Stock 5850 is 55% which is quite loud. 30% on idle should be plenty, ramping up to 45%ish in game.
yeah thats understandable that it would make a slight noise on some games but the squealing on minecraft was making me worry perhaps I should get on the phone to ocuk support and see what they think