No you don't lose out on warranty.Plus if you do it yourself and it doesn't work out then you will lose out on warranty.
As MSI have been senting us the overclocked bios to flash are selfs and said if it don't work then RMA the card back to them

hi guys,
sorry again for the screw up at the factory, wrong bios used
i'm in the process of getting the latest version of the OC BIOS sent over from HQ and I'll have it available for those of you who want to flash it yourselves, pretty easy process as i'm sure most of you already know.
i'll post it up once I have it hosted somewhere.
Obviously if there are any that don't like the OC settings after flashing they are fully covered under warranty.
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