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I added RAM to my laptop (from 6GB to 8GB) but now only 3.48GB is usable?

Just curious what I am doing wrong and how I can make all of my RAM usable. I'm not very knowledgeable on this sort of stuff, so if any answers could be explained in really simple terms, it would be appreciated!

I had 6GB of Ram in my laptop before (one 2GB and one 4GB) I replaced the 2GB with a new 4GB. According to my manual, the 4GB in my laptop already was hp part # 621569-001 so I just ordered another one of the same kind.

Here is my system info:

OS: Windows 7 Home Premium 64 bit
Model: HP Pavilion dv6 Notebook PC
Processor: AMD A6-3420M APU with Radeon HD Graphics (4 CPUs) ~1.5ghz
Memory: 8192MB RAM
Page file: 2153MB used, 4968 available
DirectX 11
(Display page) Grapihcs: AMD Radeon HD 6520G
(Display) Approx total memory: 3024MB (before installing RAM, it was 4044MB)

On the Task Manager...
Physical Memory Total: 3561 (before installing RAM it was 5609)
Cached: 1381
Available: 1390
Kernel Memory Paged: 204, Nonpaged: 49

Any help would be appreciated!
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  1. Best answer
    Your unit has an APU onboard which means it's sharing some memory from your physical ram. You may want to go into your BIOS and scope out the options to reduce your shared memory. To get into BIOS you may hit the F10 as per your manual and under system configuration you should see an option to manage your shared memory.

    I must ask though, did you make sure your BIOS was up to date prior to performing your ram upgrade? Are you sure you bought the exact same module? Can you pass on a link to it?
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