MSI MS-8801 Guia do Utilizador descarregar pdf (Página 55)

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MS-6791 M-ATX Mainboard

DRAM Frequency

This item is used to configure the clock frequency of the installed DRAM.

Settings: By SPD, 100MHz, 133MHz, 166MHz, 200MHz.

DRAM Timing Control

Selects whether DRAM timing is controlled by the SPD (Serial Presence

Detect) EEPROM on the DRAM module. Setting to By SPD enables

DRAM timings to be determined by BIOS based on the configurations on

the SPD. Selecting Manual allows users to configure the DRAM timings

manually.

DRAM CAS Latency

This controls the timing delay (in clock cycles) before SDRAM starts a

read command after receiving it. Settings are: 2T, 2.5T, 3T. 2T increases

the system performance while 3T provides the most stable performance.

RAS Active Time (tRAS)

This setting controls the number of clock cycles for DRAM to be allowed

to precharge from the active state. Settings: 4,T, 5T, 6T, 7T, 8T, 9T.

RAS Precharge Time (tRP)

This item controls the number of cycles for Row Address Strobe (RAS) to

be allowed to precharge. If insufficient time is allowed for the RAS to

accumulate its charge before DRAM refresh, refresh may be incomplete

and DRAM may fail to retain data. This item applies only when synchro-

nous DRAM is installed in the system. Available settings: 2T, 3T, 4T, 5T.

RAS to CAS Delay (tRCD)

When DRAM is refreshed, both rows and columns are addressed

separately. This setup item allows you to determine the timing of the

transition from RAS (row address strobe) to CAS (column address strobe).

The less the clock cycles, the faster the DRAM performance. Setting

options: 2T, 3T, 4T, 5T.

MA 1T/2T Select

This setting controls the SDRAM command rate. Selecting 1T allows

SDRAM signal controller to run at 1T (T=clock cycles) rate. Selecting 2T

makes SDRAM signal controller run at 2T rate. 1T is faster than 2T.

Setting options: Auto, 1T, 2T.

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MSI MS-8801 Guia do Utilizador Página 55