Does MSI void warrantys for overcloking video cards??

This is directly from their website, I think damage from overclocking would fall under "Operator Error". But seriously, how would they know you overclocked it? As long as you don't make the overclock permanent by flashing the BIOS, I think you'd be fine.

Limited Warranty Exclusions

1. Products damaged by any catastrophe, accident or from neglect, misuse, fault, improper assembly, improper maintenance, inadequate return packaging, or negligence by the customer or any third party. There will be no warranty for external cause to the Products such as, but not limited to, failure of or faulty electric power, air conditioning, operator error, failure or malfunction of any data communications system. MSI will not repair or replace product that has not been sold or leased to customer or any third party.
2. Service and repair of accessories, apparatus, attachments or any other devices which are not MSI Products or options.
3. Defacing of product or product labeling (label alterations, serial number missing, serial number no longer discernible, serial number invalid). All serial numbers are recorded and tracked for warranty purposes.
4. Unauthorized changes, modifications or alterations in or to the Products not installed by MSI.
5. Damage to or loss of any programs, data, or removable storage media.
6. Installation, relocation or removal of the Products or any accessories, apparatus, attachments or other devices.
7. Normal wears and tears.
8. The furnishing of accessories or supplies.
9. Removal, installation, and set-up service charges.
10. Damage by shipping carrier.
11. Incompatibility issue.
12. MSI is not responsible for damages of any kind including, but not limited to, direct or indirect damages, lost profits, lost saving, or other special incidental, exemplary or consequential damages whether for breach of contract, tort or otherwise, or whether arising out of the use of or inability to use the product, even if MSI or any distributor, dealer, or authorized service provider has been advised or the possibility of such damages, or any claim by any other party.
13. MSI reserves the right to change this policy without advance notice.