Gigabyte GA-P55A-UD6 User Manual page 46

>>>>> Channel A/B Turnaround Settings
CMOS Setup Utility-Copyright (C) 1984-2009 Award Software
>>>>> Channel A Reads Followed by Reads
x Different DIMMs
x Different Ranks
x On The Same Rank
>>>>> Channel A Writes Followed by Writes
x Different DIMMs
x Different Ranks
x On The Same Rank
higf: Move Enter: Select
F5: Previous Values
>>>>> Channel A/B Reads Followed by Reads
Different DIMMs
Options are: Auto (default), 1~8.
Different Ranks
Options are: Auto (default), 1~8.
On The Same Rank
Options are: Auto (default), 1~2.
>>>>> Channel A/B Writes Followed by Writes
Different DIMMs
Options are: Auto (default), 1~8.
Different Ranks
Options are: Auto (default), 1~8.
On The Same Rank
Options are: Auto (default), 1~2.
BIOS Setup
Channel A Turnaround Settings
6 Auto
5 Auto
1 Auto
6 Auto
6 Auto
1 Auto
+/-/PU/PD: Value F10: Save
F6: Fail-Safe Defaults
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Item Help
Menu Level 
ESC: Exit F1: General Help
F7: Optimized Defaults