We recommend this test be run for at least six hours if you believe you have determined your final memory clock. Reduce the memory clock by 10MHz, and allow Furmark to test the setting for at least three hours. If the driver undergoes a VPU recovery or the PC restarts, you have discovered the point at which the memory on your graphics card is unstable. If at the end of 15 minutes the PC has not rebooted and the graphics driver has not thrown a VPU recovery, begin a process of gradually increasing the memory clock by 5-10MHz and testing after every increase.
After you apply the setting, bring the Furmark window to the foreground, and allow the test to run uninterrupted for about 15 minutes. Most 5850s are capable of exceeding the overdrive limit set in the Catalyst drivers, so we suggest setting your memory clock to 1150MHz as your starting point.
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