ASUS P5Q-E

[victoe]

problem running the system with 8 gigabyte memory DDR2 and Windows 7 Ultimate 64 bit. I get all the time blue screen when starting the system. If I use only 4 no problem.

 

[GhislainG]

What memory modules? Did you increase voltage a bit when using 4 modules?

 

[victoe]

Hi,

I am using Corsair 8GB KIT , 4 modules of model CM2x2G6400C4DHX, 4-4-4-12, 2T, 2,1V ver. 1.2...

I changed in BIOS only these values...because the other values that can be changed in AI Tweaker ( BIOS-P5Q-E) I can not find any documentation about them....

So your help is very useful if you have some alternatives to check....

Best regards,
Victor

 

[GhislainG]

You didn't start with the ideal kits (modules that run at 1.8V-1.9V are preferred), but you should try 5-5-5-15 timings.

 

[victoe]

as I can see these memory modules are made to bu used with 4-4-4-12 2T, 2,1V.
But anyway I will change the ASUS minboard with some Gigabyte that is working without these problems......

 

[GhislainG]

I have a P5Q Deluxe and a Gigabyte GA-EP45-UD3P (and others) based on the same chipset. The Asus is a bit more picky, but don't expect the Gigabyte (you didn't say which one and not all are created equal) to run them perfectly. The modules are designed to run at 4-4-4-12 2T, 2.1V when 2 modules are installed. When installing 4 modules, you need to run them with more voltage (I wouldn't because they require too much voltage) or, as I suggested, loosen the timings. You could also run them at 667 MHz and you probably won't notice the performance difference. You're not the only one having issues with 8 GB of CM2X2048-6400C4DHX.

These G.Skill kits with 4-4-4-12 timings work well with 8 GB:

F2-6400CL4D-4GBPI-B (they work well in all motherboards that I tested them in)

F2-6400CL4D-4GBHK (another good kit)

Any kit that requires more than 1.9V for 2 modules will be more challenging when installing 4 modules.

 

[victoe]

If I run tehm at 667 should I keep the same timing 4-4-4-12 and the same voltage 2,1V or you suggest other values ?

 

[GhislainG]

First I would try 5-5-5-18 at 800 MHz. Then I'd try 4-4-4-12 at 667 MHz and 2.1V. If stable (memtext86+ for several hours), lower the voltage until you start getting memory errors. Then increase the voltage back to a stable value. The goal is to get a stable system.

 

[victoe]

Hi ,

I think I solved the problem......
I changed the PSU with one much stronger 650W....
I run the memory at 800MHz, 4-4-4-12, 1,9V and some other setings from ASUS manual for CPU and NB...

I made several both cold and worm resets and it seems that the PC is working now very well.....

We will see.....

But I thank you very much any way......

BR
Victor

 

[GhislainG]

Since I use quality PSUs, I never ran into that type of issue. What PSU did you have? I'm asking because that's valuable info for other members.

 

[victoe]

It was a 540W PSU Zalman.... Now I have a stronger , 650W.... but the difference can be on other parameters too.... But anyway is very strange that ASUS support never asked about this item ...and only sent me to their QVL inspite of my description of memery I used...... Very unprofesional, very bad quality .... "chineeze" if I want to describe only in one word.....

 

[GhislainG]

You didn't list all system specs, but a Zalman 540W isn't a bad PSU.

 

[victoe]

how to explain that the system is working with the new PSU but not with the old one ?

 

[GhislainG]

The old one might be defective (like a budged capacitor) and not provide clean voltages. It doesn't mean that it won't work, but it's enough to make the system less stable than it should. You could hook up a scope to check for excessive ripple.

Edit: If it's an older PSU with a weak 12V rail, that could also cause such issues.

 

[victoe]

YES, very possible but I do not have time to do this ......The old one seems to work well with a normal base configuration...... so I will use it like this.....
Thank you anyway......