Nvidia 650I Computer Hardware User Manual


 
Installing and Configuring the NVIDIA nForce 650i Ultra Motherboard
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RAS to RAS Delay
The RAS-to-RAS delay (tRRD) is the is the amount of cycles it
takes to activate the next bank of memory (this is the opposite of
tRAS). The lower the timing the better the system performance.
However, this scenario can cause instability. Adjustable from 1 to
15.
Refresh Rate
This value is filled in by the system and can not be changed by
the user.
Memory bank switch
The row Precharge time (tRP) is the minimum time between active
commands and the read/writes of the next bank on the memory
module. Adjustable from 1 to 15.
R to W Turnaround
The Read-to-Write turnaround (tRWT) is a the amount of cycles
for the command to be executed when a Write command is
received. Adjustable from 1 to 15.
R to R Timing
the Read-to-Read time (tRDRD) is the number of clock cycles
between the last read and the subsequent READ command to the
same physical bank. Adjustable from 1 to 15.
Row Cycle Time
The Row Cycle Time is the minimum time in cycles it take a row
to complete a full cycle. This can be determined by
tRC=tRAS+tRP. If this value is set too short, it can cause
corruption of data. If this value is set too high, it causes a loss in
performance but an increase in stability. Adjustable from 1 to 63
cycles
W to R Command Delay
The Write-to-Read (tWRD) command delay is the amount of cycles
required between a valid write command and the next read
command. A lower cycle time results in better performance but is
can instability. Adjustable from 0 to 6 cycles.
W to W Timing
The Write-to-Write (tWRWR) timing is the number of clock cycles