Press F4 to access Hidden menu when your in CHIPSET menu.
Then choose PCI EXPRESS CONFIGURATION.
You should now see PORTS #02 - #12.
#02 and #11 are the 16x lanes or ports. The first option is to set AUTONonomous or Autonegotiation.
Then set lanes to 16x
then I Set lane watts to 200(default is 75)..I do this no matter what card i Run ATI/Nvidia. This helps alot When overclocking or pushing a 3870/4870/4890 Set to at least 150watts if your gonna push the Cards and or the HTT.
Mine has been 200 from day one.
As for the L1 to L0..
Leave the L1 and L0 on auto. you never need to touch it.
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