Will windows 7 64bit fix 3gb of ram usable on Windows 10?

Solution
Well my feet don't taste so good. I thought since you had a 64 bit Xeon equivalent to a Core 2 Quad, you'd easily be able to handle more than 4GB. While the CPU can handle it, you've paired it with what I think might be the worst motherboard for those range of CPU's. It only supports 4GB and furthermore there is no way to make it address all of it via a Memory Remap setting in the BIOS.

I have a motherboard here that was available in June 2006 when the first Core 2's came out (I got a E6700) and it supports 8GB. It's in a system that my wife uses daily with a Q6600 and 8GB or RAM. I've got a second one on the shelf (P5Q Deluxe) that came out a year later that also supports 16GB or RAM. Again, that is quite literally the worst...

TbsToy

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Oct 19, 2015
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Only if there is a 64 bit processor installed and there is more installed memory available. Unknown quantities. An incomplete question is nearly impossible to answer. CPUID string, 64T.
W.P.
 


A 32bit processor will probably not be on a mobo with a controller that can hadle sticks of memory that can amount to 4gigs. You're talking first gen P4 here.
 
Ha ha, everyone was going off about you not having a 64 bit CPU. Nom nom nom, how do those feet taste?

At the OP, you are already running a 64 bit OS, so if you aren't seeing 4GB of RAM, then it's likely something isn't set up right in your BIOS.

What motherboard do you have? It's probably a setting in the BIOS like Memory Remap (the name is different for different manufacturers), this needs to be enabled or the OS won't see anything above 4GB. The reason you are seeing 3GB is the motherboard resources and VRAM, etc have to take addresses from this 4GB pool as well.
 
Well my feet don't taste so good. I thought since you had a 64 bit Xeon equivalent to a Core 2 Quad, you'd easily be able to handle more than 4GB. While the CPU can handle it, you've paired it with what I think might be the worst motherboard for those range of CPU's. It only supports 4GB and furthermore there is no way to make it address all of it via a Memory Remap setting in the BIOS.

I have a motherboard here that was available in June 2006 when the first Core 2's came out (I got a E6700) and it supports 8GB. It's in a system that my wife uses daily with a Q6600 and 8GB or RAM. I've got a second one on the shelf (P5Q Deluxe) that came out a year later that also supports 16GB or RAM. Again, that is quite literally the worst Core 2 era motherboard I've ever seen. So it doesn't matter which 64 bit OS you install, you'll never see more than the ~3GB your seeing now with that motherboard. I had no idea that any Core 2 era motherboards were made that only supported so little RAM.

Sorry to be the bearer of bad news. If you want to address the full 4GB or more, you'll need a different motherboard.
 
Solution
Hopefully you can find one. They are out there. I'm sure Ebay or somewhere like that. I'm quite certain that you won't find a new one. Good luck and keep us posted. If you find one and are uncertain about whether it will work with more than 4GB or any other question really, just post back here.

Edit: I was just on Fleabay and found both models that I own for sale. So if either of them interest you, they are very good motherboards. The P5W DH Deluxe is still running and has been for near 10 years. The other (P5Q Deluxe) ran for over 7 years continuously. In fact my systems are on 24/7, they never get shutdown. So if that isn't a testament to their longevity, I don't know what is. Furthermore, the CPU's in them were all overclocked. Though the P5W DH Deluxe that's in my wifes computer has the Q6600 at stock because she doesn't need the extra performance for FaceBook, Ebay, and general internet use.

So assuming you can get a seller that is reputable, I wholeheartedly recommend either motherboard.