MSI P55A User Guide - Page 64

CPU Amplitude Control/ PCIE Amplitude Control

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BIOS Setup This setting determines the time RFC takes to read from and write to a memory cell. ▶ CH1/ CH2 tWR Minimum time interval between end of write data burst and the start of a precharge command. Allows sense amplifiers to restore data to cells. ▶ CH1/ CH2 tWTR Minimum time interval between the end of write data burst and the start of a column-read command. It allows I/O gating to overdrive sense amplifiers before read command starts. ▶ CH1/ CH2 tRRD Specifies the active-to-active delay of different banks. ▶ CH1/ CH2 tRTP Time interval between a read and a precharge command. ▶ CH1/ CH2 tFAW This item is used to set the tFAW timing. ▶ Current CH1/ CH2 tdrRdTRd/ tddRdTRd/ tsrRdTWr/ tdrRdTWr/ tddRdTWr/ tsrWrTRd/ tddWrTWr/ tsrRDTRd/ tsrWrTWr These item show the advanced DRAM timings. ▶ Channel 1/ Channel2 Advanced Memory Setting Setting to [Auto] enables the advance memory timing automatically to be determined by BIOS. Setting to [Manual] allows you to set the following advanced memory timings. ▶ Memory Ratio This item allows you to set the memory multiplier. ▶ Adjusted DRAM Frequency (MHz) It shows the adjusted DRAM frequency. Read-only. ▶ QPI Ratio This item allows you to set the QPI multiplier. ▶ Adjusted QPI Frequency (MHz) It shows the adjusted QPI frequency. Read-only. ▶ ClockGen Tuner Press to enter the sub-menu and the following screen appears. ▶ CPU Amplitude Control/ PCIE Amplitude Control These items are used to select the CPU/ PCI Express clock amplitude. 3-24

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BIOS Setup
This setting determines the time RFC takes to read from and write to a memory
cell.
CH1/ CH2 tWR
Minimum time interval between end of write data burst and the start of a precharge
command. Allows sense amplifiers to restore data to cells.
CH1/ CH2 tWTR
Minimum time interval between the end of write data burst and the start of a col-
umn-read command. It allows I/O gating to overdrive sense amplifiers before read
command starts.
CH1/ CH2 tRRD
Specifies the active-to-active delay of different banks.
CH1/ CH2 tRTP
Time interval between a read and a precharge command.
CH1/ CH2 tFAW
This item is used to set the tFAW timing.
Current CH1/ CH2 tdrRdTRd/ tddRdTRd/ tsrRdTWr/ tdrRdTWr/ tddRdTWr/
tsrWrTRd/ tddWrTWr/ tsrRDTRd/ tsrWrTWr
These item show the advanced DRAM timings.
Channel 1/ Channel2 Advanced Memory Setting
Setting to [Auto] enables the advance memory timing automatically to be determined
by BIOS. Setting to [Manual] allows you to set the following advanced memory tim-
ings.
Memory Ratio
This item allows you to set the memory multiplier.
Adjusted DRAM Frequency (MHz)
It shows the adjusted DRAM frequency. Read-only.
QPI Ratio
This item allows you to set the QPI multiplier.
Adjusted QPI Frequency (MHz)
It shows the adjusted QPI frequency. Read-only.
ClockGen Tuner
Press <Enter> to enter the sub-menu and the following screen appears.
CPU Amplitude Control/ PCIE Amplitude Control
These items are used to select the CPU/ PCI Express clock amplitude.
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