Gigabyte GA-A75-UD4H User Manual - Page 39

CPU Host Clock Control, CPU FrequencyMHz, PCIe Spread Spectrum, Set Memory Clock, DDR3 Timing Items - overclock

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CPU Host Clock Control Enables or disables the control of CPU host clock. Auto (default) allows the BIOS to automatically adjust the CPU host frequency. Manual allows the CPU Frequency(MHz) item below to be configurable. Note: If your system fails to boot after overclocking, please wait for 20 seconds to allow for automated system reboot, or clear the CMOS values to reset the board to default values. CPU Frequency(MHz) Allows you to manually set the CPU host frequency. This option is configurable only when CPU Host Clock Control is set to Manual. Important It is highly recommended that the CPU frequency be set in accordance with the CPU specifications. PCIe Spread Spectrum Enables or disables PCIe Spread Spectrum. (Default: Disabled) Set Memory Clock Determines whether to manually set the memory clock. Auto lets BIOS automatically set the memory clock as required. Manual allows the memory clock control item below to be configurable. (Default: Auto) Memory Clock This option is configurable only when Set Memory Clock is set to Manual. X5.33 Sets Memory Clock to X5.33. X6.66 Sets Memory Clock to X6.66. X8.00 Sets Memory Clock to X8.00. X9.33 Sets Memory Clock to X9.33. DRAM Configuration CMOS Setup Utility-Copyright (C) 1984-2011 Award Software DRAM Configuration DDR3 Timing Items x 1T/2T Command Timing x CAS# latency x RAS to CAS R/W Delay x Row Precharge Time x Minimum RAS Active Time x TwTr Command Delay x Trfc0 for DIMM2, DIMM4 x Trfc1 for DIMM1, DIMM3 x Write Recovery Time x Precharge Time x Row Cycle Time x RAS to RAS Delay x Four Bank Activate Windows [Auto] Auto Auto Auto Auto Auto Auto Auto Auto Auto Auto Auto Auto Auto SPD -9T 9T 9T 24T 5T 110ns -10T 5T 33T 4T -- Auto -9T 9T 9T 24T 5T 110ns -6T 4T 20T 4T -- Item Help Menu Level  Bank Interleaving [Enabled] Move Enter: Select F5: Previous Values +/-/PU/PD: Value F10: Save F6: Fail-Safe Defaults DDR3 Timing Items Manual allows all DDR3 Timing items below to be configurable. Options are: Auto (default), Manual. 1T/2T Command Timing Options are: Auto (default), 1T, 2T. ESC: Exit F1: General Help F7: Optimized Defaults - 39 - BIOS Setup

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- 39 -
BIOS Setup
CPU Host Clock Control
Enables or disables the control of CPU host clock.
Auto
(default) allows the BIOS to automatically adjust
the CPU host frequency.
Manual
allows the
CPU Frequency(MHz)
item below to be configurable.
Note: If your system fails to boot after overclocking, please wait for 20 seconds to allow for automated
system reboot, or clear the CMOS values to reset the board to default values.
CPU Frequency(MHz)
Allows you to manually set the CPU host frequency. This option is configurable only when
CPU Host
Clock Control
is set to
Manual
.
Important
It is highly recommended that the CPU frequency be set in
accordance with the CPU specifications.
PCIe Spread Spectrum
Enables or disables PCIe Spread Spectrum. (Default: Disabled)
Set Memory Clock
Determines whether to manually set the memory clock.
Auto
lets BIOS automatically set the memory
clock as required.
Manual
allows the memory clock control item below to be configurable. (Default: Auto)
Memory Clock
This option is configurable only when
Set Memory Clock
is set to
Manual
.
X5.33
Sets Memory Clock to X5.33.
X6.66
Sets Memory Clock to X6.66.
X8.00
Sets Memory Clock to X8.00.
X9.33
Sets Memory Clock to X9.33.
DRAM Configuration
CMOS Setup Utility-Copyright (C) 1984-2011 Award Software
DRAM Configuration
DDR3 Timing Items
[Auto]
SPD
Auto
x
1T/2T Command Timing
Auto
--
--
x
CAS# latency
Auto
9T
9T
x
RAS to CAS R/W Delay
Auto
9T
9T
x
Row Precharge Time
Auto
9T
9T
x
Minimum RAS Active Time
Auto
24T
24T
x
TwTr Command Delay
Auto
5T
5T
x
Trfc0 for DIMM2, DIMM4
Auto
110ns
110ns
x
Trfc1 for DIMM1, DIMM3
Auto
--
--
x
Write Recovery Time
Auto
10T
6T
x
Precharge Time
Auto
5T
4T
x
Row Cycle Time
Auto
33T
20T
x
RAS to RAS Delay
Auto
4T
4T
x
Four Bank Activate Windows
Auto
--
--
Bank Interleaving
[Enabled]
higf
: Move
Enter: Select
+/-/PU/PD: Value
F10: Save
ESC: Exit
F1: General Help
F5: Previous Values
F6: Fail-Safe Defaults
F7: Optimized Defaults
Item Help
Menu Level
DDR3 Timing Items
Manual
allows all DDR3 Timing items below to be configurable.
Options are: Auto (default), Manual.
1T/2T Command Timing
Options are: Auto (default), 1T, 2T.