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Configuring the BIOS
NVIDIA Corporation
October 17, 2007 | DU-03597-001_v01 47
Ø Expert
Use the Page Up and Page Down keys to select Expert. When Expert 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.
w tCL: CAS# latency (options are 1 through 6).
w tRDC: RAS#-to-CAS# Delay for Read/Write commands to the
same bank (options are 1 through 7).
w tRP: Row Precharge time. This is the Precharge-to-Active or Auto-
to-Refresh of the same bank (options are 1 through 7).
w tRAS: This is the minimum RAS# active time (options are 1 through
31).
w Command Per Clock: This is the command timing setting on a per
clock unit basis (options are 1T and 2T).
w tRRD: RAS#-to-RAS# delay of different banks (options are 1
through 15).
w tRC: RAS#-to-RAS# or auto refresh time of the same bank (options
are 1 through 31).
w tWR: The Write recovery time (options are 2 through 7).
w tWTR: This is the minimum write-to-read delay with the same chip
selected (options are 1 through 10).
w tREF: This is the DRAM refresh rate (options are Auto, 7.8uS, and
3.9uS).
Parameters Settings Current Value
Memory Timing Setting [Expert]
tCL (CAS Latency) [Auto(5)] 5
tRDC [Auto(7)] 5
tRP [Auto(7)] 5
tRAS [Auto(23)] 18
Command Per Clock (CDM) [Auto(2T)] 1T
** Advanced Memory Settings **
tRRD [Auto(4)] 3
tRC [Auto(28)] 22
tWR [Auto(7)] 5
tWTR [Auto(10)] 9
tREF
[Auto]
6.1uS