Ram Problem

[Ophelia_]

Hello people. I have 4 rams.

the first pair is this: http://www.ec.kingston.com/ecom/con...sp?root=&LinkBack=&ktcpartno=KHX6400D2LLK2/2G

and the second is this: http://www.valueram.com/datasheets/kvr800d2n5k2_4g.pdf

And i keep getting BSOD when i plug them in together.
How can i make them work together? I thik that i have to change the timing but i am not sure.. I know that i do that in the BIOS but i want to ask you how to because i dont want to destroy anything.
My motherboard is ASUS P5Q.

Thanks in advance!

 

[akxpckwb]

Do they even work together? According to the links provided there are some differences between them which may make them incompatible

 

[Ophelia_]

Sometimes they do, sometimes they dont!

 

[Ophelia_]

Can anyone help me please?

 

[Ophelia_]

I tested the second pair of ram alone with windows 7 memory diagnostics and i did not get any errors. Also the tech support from the store did not find any errors but i get blue screens and restarts. And a friend of mine tested that too and he experienced the same problems. :/ Any ideas?