Memory Issues

I have a Dell e510, 3.0g HT processor, Geforce 8400 video, ........I had to install Win 7 64 with just 2gigs of RAM.  After the install I added in another 2g of RAM.  It booted up and is working fine except its showing 4gigs with 3.25 usable.  I installed another gig of memory for a total of 5gig, (which my bios shows properly), but Win 7 wont boot with the extra gig. 

So the 2 questions are, why is it only showing 3.25 usable?  is that a vid card memory thing? 

and 2, why won't it take the other gig of memory when the bios recognizes it fine?
 

Question Info


Last updated March 13, 2018 Views 896 Applies to:
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Windows Expert - Consumer

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