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Can i run different memories?


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i have 4 sticks of ram. Apparently they seem identical but if you look carefully on them they have different specifics.

This is what u can find on them:


CM2 x 1024 - 6400c4 4-4-4-12 800MHz 2.10 v vers 6.2


CM2 X 1024 - 6400 5-5-5-15 800MHr vers.5.1


My question is: can i use all 4 sticks at the same time on my PC without problems? and if yes, do i have to set something in my BIOS?


Ty for your help.

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1° try:


sometimes system starts, sometimes not, sometimes after few mins or when i run a game the screen becomes blu and i get a message about a video driver NVLDDMKM wich stops working.


Any suggestion for make systerm run more stable pls?

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With 4 modules I would suggest setting the memory frequency at DDR667 and set the memory Voltage to 2.1 Volts and set the NB/MCH/SPP Voltage to +.2 Volts as well and test the system with http://www.memtest.org. In addition, with some MB's (Mostly ASUS) you have to disable legacy USB in the bios when running any memory test.
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Download Memtest Version 2.11 from--->

and extract the ISO image. Burn the ISO image to an CD-ROM disk.4

Download CPU-z from

Shut the system down and enter your BIOS, Load Setup Defaults, Save Setup Defaults and set to these values:


JumperFree Configuration
AI Tuning = Manual
Overclock Options = Disabled

System Clocks
NB PCI-e Frequency (MHz) = 100

Voltage Control
Vcore Voltage = Auto
Memory Voltage = 2.1v
NB Core Voltage = 1.32v

FSB & Memory Config
FSB - Memory Clock Mode = Unlinked
FSB - Memory Ratio = 3:5 (667Mhz)
FSB (QDR) = 266


Memory Timing Setting
tCL = 4
tRCD = 4
tRP = 4
tRAS = 12
Command Per Clock = 2 Clocks
tRRD = Auto
tRC = Auto
tWR = Auto
tWTR = Auto
tREF = Auto
tRD = Auto
tRFC = Auto
Async Latency = Auto

USB Configuration
USB Controllers = Enabled
USB Legacy Support = Disabled  (Disable when you memtest. Enable afterwards if you have usb keyboard)
USB 2.0 Controller = Enabled

Run Memtest for two full passes, then (If Stable), enter Windows and post screenshots of CPU-z's CPU, Memory and SPD tabs

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