Can't use both my "CM2X1024-6400C4DHX" sets without stability issues, diff lables.

[KriLL3]

Hi there folks, I got a machine I used to game on but it's gotten very unstable after some upgrades etc, my first reaction was checking for cooling problems, nothing there, I fiddled with all aspects of the machine over the course of months, I don't game a lot anymore and it was only during gaming the system hard rebooted, no errors, no slowdown, nothing, the screen just turns black and the system reboots.

 

I finally started investigating the ram today, a part of the machine I've taken for grated since I bought 2 "CM2X1024-6400C4DHX" sets.

 

When I pulled em out I saw their labels are different:

 

Set 1 got this label:

CM2X1024-6400C4DHX

XMS2-6400 1024MB 800Mhz 4-4-4-12 XMS6405v2.5

07300086

 

Here is Set2:

CM2X1024-6400C4DHX

XMS2-6400 1024MB 800Mhz 4-4-4-12 2.10V ver2.1

07480687

 

From quickly scanning some topics in the forum I suppose this means they're incompatible? funny I bought them from the same company 2 months apart... "CM2X1024-6400C4DHX" + "CM2X1024-6400C4DHX" = calamity, who would have thought? :|

 

Any suggestions for getting out of this mess? can I buy another set somewhere that matches either of these you think? I got a machine that could use one of the sets so no major loss in getting an additional set but I want to make sure there is 2 sets that work together, the odd one out can go into my other machine.

 

Also any suggestions what voltage & timings to use with the sticks? the second is quite clear on 2.10V but the first is a bit more mysterious, I don't know if v2.5 means version or volt, and I don't want to find out the hard way...

 

I'm unsure what exact values 4-4-4-12 refers to also, when I open up the memory timings on my "Asus P5N32-E SLI PLUS" mobo I get a whole lot more rows to edit than 4.

 

Thanks in advance for any assistance.

[fatalheadache]

What do you have them set at 800Mhz or 667Mhz? 667Mhz is what they must be at to run 4 sticks. I see they are different sticks but its worth a shot.

[KriLL3]

I ran them at "400Mhz" I guess that means 800? you think it's worth a shot running them at 333/334?

[KriLL3]

Thanks for the 667MHz tip fatalheadache, I've somehow missed that you need to run 4 sticks at a lower Hz than 2, doesn't make much sense to me... but it works.

 

I'm currently running all 4 at:

 

Frequency: 333.3MHz

FSB:DRAM: 9:10

CAS (tCL): 4.0

RAS to CAS (tRCD): 4

RAS to Precharge (tRP): 4

Cycle Time (tRAS): 12

Bank Cycle Time (tRC): 19

Command Rate (CR): 2T

 

And so far it's smooth sailing :), I heard somewhere that tRC = tRP + tRAS, should I set it to 16 instead of 19?

I heard somewhere that if you run more than 1 stick it's a good idea to increase the voltage a bit, I'm currently running on 2.100, any suggestions what I should change it to or if I should?

[RAM GUY]

TRC should be set to 24 Cas+TRP+TRCD+TRAS = TRC =24.

[KriLL3]

Big thanks for the help. :)

 

Does http://www.krill3.com/ram2.png look correct to you?

 

Would faulty ram settings work fine with normal use but cause the system to reboot during gaming? all temperatures are fine, my PSU is beefy and far from cheap and the rest of my hardware seems fine.

[RAM GUY]

Yes but if you have any problems I would also set the NB/MCH Voltage to 1.45 Volts as well.