but using 64 -bit OP. system, x64 based processor then what is the problem ? I want to use full 4 GB RAM !!!
just a lay man ... don't know how to check BIOS settings.... How to get step - by- step process to increase Memory usage from 3.4 GB to 4 GB. I think I am able to put my problem here fully understandable to all !
Hardware Reserved memory is set by the motherboard and can't / shouldn't be changed. Don't bother trying to increase usable ram. *Hardware Reserved memory can be more or less depending upon the motherboard.
I've never seen 500MB disappear without it being reserved for GPU or other onboard hardware, on x64 OS. @usermydigitallyfe, can you show us the system info page? And run the QT from here and post the saved report here in code tags?
@usermydigitallyfe: The answer, although quite complex, is simple. That little bit of RAM is simply not available to the OS. (Actually, it's not available to -any- OS) The processor (also known as the CPU) needs a little bit of RAM, so that it can function separately from whatever OS is being loaded by the system. The CPU starts up first by running a boot loader in the BIOS. The boot loader checks to see what OS you're trying to run. it then runs another routine in the BIOS, and does a disk load, based on which media is valid (CD/DVD,floppy, HDD, etc.) When the OS starts up, it only has the remainder of the RAM to use. That's pretty much true for -any- OS. So, it's a hardware thing...
Could you please run the QT and post the saved report here in code tags? It doesn't contain privacy sensitive info. I still guess it's used for GPU shared memory. As @Michaela Joy explained, the "missing" amount of RAM is used by at least something to get your system to work, it's only not available for the running OS.