Jump to content
Corsair Community

DX58SO and CM3X2G1333C9 - memory timing and Host Clock?


Recommended Posts

All -


Just got a new rig and am trying to get my initial CPU/Memory timings

and multipliers to a good "optimal" starting point.


I have a few questions (see below) if anyone wants to drop the clue stick on me.


My Hardware:


Intel DX58SO (BIOS SOX5810J.86A.5390.2010.0614.1053)

Core i7 930

3x 2GB CM3X2G1333C9 (TR3X6G1333C9)

ASUS PCE-N13 PCI-E 1x 802.11n

PCI-E GPU (upgrading in a day)


My current setup per CPU-Z -


Northbridge Intel X58 rev. 13

Memory Type DDR3

Memory Size 6144 MBytes

Channels Triple

Memory Frequency 666.7 MHz (2:10)

CAS# latency (CL) 9.0

RAS# to CAS# delay (tRCD) 9

RAS# Precharge (tRP) 9

Cycle Time (tRAS) 24

Row Refresh Cycle Time (tRFC) 59

Command Rate (CR) 2T

Uncore Frequency 2666.8 MHz


Three memory modules:


Manufacturer (ID) Corsair (7F7F9E0000000000)

Size 2048 MBytes

Max bandwidth PC3-10700H (667 MHz)

Part number CM3X2G1333C9

Manufacturing date Week 51/Year 09

Number of banks 8

Nominal Voltage 1.50 Volts

JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency

JEDEC #4 9.0-9-9-24-34 @ 666 MHz


CPU Settings (my current settings are the "Active" settings) -



For some reason, the DX58SO wants to set the Host Clock Frequency to

135 MHz. Is this generally safe?


Memory Settings:



Speedstep Settings:



The Memory Settings image above shows my tRC as 27 - this should be

34, correct? All the other settings are as shown in the image, with

the exception of tRFC, which is now 59 (the system is unstable at

anything lower than this).


I'm not trying to overclock at the moment - just trying to get my

memory and CPU timings to their optimal values. From what I could

tell, the DX58SO wanted to set the memory timing to 1066 and the Host

Clock to 135 MHz. The white paper for the Corsair modules states, "SPD

programmed at: JEDEC standard 9-9-9-24 values at 1333MHz".


My questions:


* Should Host Clock Frequency be set to 135 MHz? Is this safe?

* Are my CL-tRCD-tRP-tRAS-tRC and tRFC values and voltages optimal for

my modules?

* Are my CPU multiplier, Host Clock and CPU voltages optimal?

* Is there a more complete list of the optimal Memory timing values

(that includes the uncommon ones listed in the BIOS)?

* Are there any other settings (Speedstep) I should consider changing?


I'm using stock cooling and am not opposed to overclocking. What's the

best way to go about this for my setup and what's a reasonable

overclock to shoot for with my setup?


Thanks very much for your help!

Link to comment
Share on other sites


This topic is now archived and is closed to further replies.

  • Create New...