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Windows 7: will RAM(usable) differs on the bit size of the Operating System?

11 Jun 2011   #1

Windows 7 Home Premium 32bit
will RAM(usable) differs on the bit size of the Operating System?


I have windows 7 Home premium 64bit installed and I got

Processor: Pentium(R) Dual-Core CPU T4300@2.10GHz 2.10 GHz
Installed memory (RAM): 4.00 GB (3.84 GB usable)
System Type: 64-bit Operating System

Now I had a problem with my OS and used my “Product recovery” software from Toshiba that has Windows 7 Home premium 32bit. But I found the RAM reduced to 2.84.

Processor: Pentium(R) Dual-Core CPU T4300@2.10GHz 2.10 GHz
Installed memory (RAM): 4.00 GB (2.84 GB usable)
System Type: 32-bit Operating System

Is there any solution to get the usable RAM back to 3.84?

My System SpecsSystem Spec
11 Jun 2011   #2

Windows 7 Home Premium 32-Bit - Build 7600 SP1

Quote   Quote: Originally Posted by pradeepV View Post

Is there any solution to get the usable RAM back to 3.84?
You won't get it back. I am using X86 with 4 GB ram. My usuable is 3.0 GB. The reason that you had more with X64 is that it can use more of your ram. If you would have in stalled 6 GB, you would have had about 5. 3 GB usuable. With X86 4 GB is all it can take and usable is less.
My System SpecsSystem Spec
11 Jun 2011   #3

Windows 10 Pro x64

It matters based on whether or not you're using x86 (32bit) or x64 (64bit), based on how the BIOS is reserving and reporting system memory. Some BIOSes (seems to be the one in your machine, as well) reserve memory for devices by "moving" the 4GB boundary - specifically, when the OS requests the memory location of the x86 boundary, the BIOS reports a memory address less than the 4GB mark. It would seem that your system's BIOS actually reserves about 154MB of RAM for onboard devices, but it also reports the 4GB boundary at approximately the 3GB location; this is not a problem for an x64 OS, which has no trouble "seeing" and using memory above the reported 4GB boundary, but an x86 OS can only use memory below the 4GB boundary, even if that boundary reported by the BIOS is less than the actual 4GB mark. That's why on your x64 system you see 4GB with 3.84GB usable, but you x86 system sees only 2.84GB usable - the BIOS still reserves it's 154MB of RAM, but it reports the 4GB boundary at the 3GB mark, thus giving you only 2.84GB usable.
My System SpecsSystem Spec

13 Jun 2011   #4

Windows 7 Ultimate x64 SP1

Knowing you had 4 GB of memory, why use an x86 recovery disc? How did you get the x64 OS installed? If you want to maximize the amount of memory you can use, go back to your x64 OS.
My System SpecsSystem Spec

 will RAM(usable) differs on the bit size of the Operating System?

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