Nvidia nForce 680i User Manual page 63

" Expert
Use the and
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is selected, all timing categories are enabled for manual input. Note that
you should set the value to Optimal to use the manufacturers'
recommended values.
Parameters
Memory Timing Setting
tCL (CAS Latency)
tRDC
tRP
tRAS
Command Per Clock (CDM)
** Advanced Memory Settings **
tRRD
tRC
tWR
tWTR
tREF
: CAS# latency (options are 1 through 6).
#
tCL
: RAS#-to-CAS# Delay for Read/Write commands to the
#
tRDC
same bank (options are 1 through 7).
: Row Precharge time. This is the Precharge-to-Active or Auto-
#
tRP
to-Refresh of the same bank (options are 1 through 7).
: This is the minimum RAS# active time (options are 1 through
#
tRAS
31).
#
Command Per Clock
clock unit basis (options are 1T and 2T).
: RAS#-to-RAS# delay of different banks (options are 1
#
tRRD
through 15).
: RAS#-to-RAS# or auto refresh time of the same bank (options
#
tRC
are 1 through 31).
: The Write recovery time (options are 2 through 7).
#
tWR
: This is the minimum write-to-read delay with the same chip
#
tWTR
selected (options are 1 through 10).
: This is the DRAM refresh rate (options are
#
tREF
).
3.9uS
Configuring the BIOS
keys to select
Expert
Settings Current Value
[Expert]
[Auto(5)] 5
[Auto(7)] 5
[Auto(7)] 5
[Auto(23)] 18
[Auto(2T)] 1T
[Auto(4)] 3
[Auto(28)] 22
[Auto(7)] 5
[Auto(10)] 9
[Auto] 6.1uS
: This is the command timing setting on a per
. When Expert
, , and
Auto 7.8uS
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