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Memory compatibility issue


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I have previuosly installed TWIN2X2048-6400C4DHX 2GB kit on my computer. No I am trying to add TWIN2X2048-6400C4DHX 4 gb kit.

I should get 6GB of memory all together, but I get 5GB.


So i tried various variants and I always get 1GB less when using 4GB kit. In order to minimaze different number of variants I took out the old 2x1024 and tried only new sticks.


- Each of the 2gb on at the time, works perfectly

- when I use both together, 3gb is maximum I get, no mather the slots I use.


Maybe you have any suggestions?

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Previously I took the info from BIOS. Today i run a memtest and it shows the same - 3007 MB width 4GB of memorysticks.


I have ASUS P5B motherboard, I cheked it should be 100% compatible with these sticks. I have placed them correctly in 1 and 3 (yellow) slot. Ofcourse I tried with the other slots aswell.


p.S I changed sticks at the store, so I have new-ones and they show the same result :) So probably it is mobo-s fault? Can I check it somehow?

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