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How much memory is really used on a 64 bit system?

Hello,

Im new to 64 bit systems but I'd like to ask, how much memory is really used on a 64 bit system when running 32 bits application?

Let's say my system has 8 gig of RAM. I know windows x64 sees the whole 8gig and can use it all, but let's say I install a software or a game that is NOT supporting 64 bit (so it's installed in "Program Files (x86)") will this software / game use all the available RAM or since it's running in 32 mode it will only see/use 3.25gb ?

Simplified: Im wondering about getting 8gb ram, does it worth it?

Cause Im re-installing all my stuff right now after a fresh win7 install and EVERYTHING seems to install in the x86 folder. All games and all softwares besides Photoshop are in the 32 bit folder and seems to be running in 32 bit...?

So if 99% of all my apps are running in 32 bits and using only 3.25gb of memory, whats the point in having more than 4gb ?

Waiting your replies, Thanks!
6 answers Last reply Best Answer
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  1. ANS "getting 8gb ram, does it worth it?" -> Yes and No. Yes if you're rendering or playing 64-bit games.

    Currently, the advantages of 64-bit OS are the use of >~3.5GB limit and Multi-Tasking, in actuality the 64-bit OS + 32-bit Apps runs slightly slower. Therefore, to see a gain 6~8GB+ is 'really' needed. Article -> http://www.tomshardware.com/reviews/ram-memory-upgrade,2778-8.html

    Memory is relatively 'cheap' so I recommend 4GB sticks {2X4GB or 3X4GB w/1366 or LGA 2011}.

    There are 64-bit Apps but you'll need to upgrade the older Apps and/or carefully select 64-bit Apps. Some games offer 64-bit versions. All 64-bit Windows 7 have several Apps listed in Program Files (x86).

    Assuming you have 2X2GB get matching RAM or replace, but 4GB is 'adequate' to run 64-bit OS.
  2. kk Thanks I'll consider that.

    Technically speaking, do you know if 32 bit games ran in 32 bit mode inside a 64 bit OS does or does not use the whole memory available e.g. 6 or 8 gb ?
  3. Short answer and the reason for the 'slower' is emulation; nice article -> http://www.techsupportalert.com/content/how-windows7-vista64-support-32bit-applications.htm

    I go out of my way to find 64-bit clean Apps... However, the speed loss isn't that great. This 'transition' time and the push is 64-bit; probably 3~5 years. XP 64-bit didn't help the 'push' but Windows 7 is an incentive for the developers.
  4. Best answer
    Any 32 bit process is limited to 4gb ram but having more in a 64 bit os will allow your os to use the extra ram for itself and other processes. A game never needs more than 4gb anyway, I dont even see my games going over 2gb.
  5. Best answer selected by Flamesjowel.
  6. k1114 said:
    Any 32 bit process is limited to 4gb ram but having more in a 64 bit os will allow your os to use the extra ram for itself and other processes. A game never needs more than 4gb anyway, I dont even see my games going over 2gb.


    Thanks thats exactly what I wanted to know.

    Thank you!
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