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19 Apr 2010  
Zen00

Windows 7 Ultimate x64
 
 

Using MSI Afterburner, and being very careful, you can overclock a 5770 upwards of 1060MHz stable.

Safe voltages that I've seen are around 1.25

Use MSI Afterburner, but make sure you tick the sync option to have both cards running at the same OC or you'll have problems.

You shouldn't have to flash the BIOS on them to do this, if the cards do give you trouble getting to higher voltages, there is a setting you can edit in the Afterburner config file that will allow you to OC higher.
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