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Old January 8, 2014, 03:10 PM
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If the issues only started after you replaced the compound it could be an improperly seated heatsink.
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Old January 8, 2014, 08:09 PM
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A 550Ti is not a hot card. Are you sure, the cooler is properly reinstalled on the card? Did you apply the TIM in a proper way? How is your wire management inside the case? Do you have a proper airflow (at least one fan sucking cold air in and one blowing hot air out the other side)? 85C-90C is waaay too high and you have performance issues because the card is throtleing 'cause the heat. It might be the cooler makes no proper contact with the GPU. To check this, remove the cooler, clean both the cooler and the GPU, than apply a pea-sized bit of thermal compound to the middle of the GPU, install the cooler, than remove the cooler again and check how the TIM was spread. From that you can see if the cooler makes proper contact.
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