Pavilion dv7-1285dx option upgrade RAM / dual channel question

Hello.  I had a few questions on my laptop dv7-1285dx I bought last January.  I explore the idea of upgrading the RAM, and I went on the site crucial and pulled these specs.

It says that my system has 8 GB of memory dual channel max capacity, but from what I read here on these forums double channel really only works when you have 2 identical modules in each slot, right?  Well, my system came at HP with 1 x 4 GB and 1 x 2 GB installed modules standard package.  (I'm running Vista x 64).

So, if this is the case, this does mean that I'm not running in double track right now and my computer is a drop in performance right out of the factory?

Another question I have is my stick of memory from Samsung.  Would I be hurt me if I bought just a stick of 4 GB of crucial and kept the other stick of 4 GB of Samsung and used these two together?  Or is it better to use two Samsung or two Crucial sticks identical?  The sticks have to come from the same kit for best performance?   (IE - in the case of the Samsung, I would of course order a single module if I went this route and kept the original I have now).

If I increase the RAM, is there anything else I need to do in the BIOS to enable function dual channel (if I don't have it right now) other that physically install the sticks?

Thank you very much.

Message edited by REB on 27/05/2009 06:46

Molvitz has clarified a bit. For memory dual channel sticks must first be the same size (2 x 2 GB or 2 x 4 GB for example) and they must be the same speed and latency times. If you shuffle the cards to Flash the same size you will probably but not certainly have dual channel operation. If you put two identical poles, you are also sure that it is possible to be that they will work in dual channel mode. I have not tried to set up a laptop with 2 x 4 gig of RAM sticks and I believe that there could be problems with channel double use, as mentioned, because this product (4 gig laptop RAM sticks) is so new. I can speak from experience wide enough that what I say above applies to 2 x 1 gig and 2 x 2 GB.

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