RAM allocation for applications in Windows 7 x64/ Where is the 3GB switch for x86 apps?

Question

Specifically where can I go in Win 7 x64 to control RAM allocation to apps/ a particular app? Someone mentioned the /3GB switch, where is that? I take it x86 apps will only be able to use max 3GB with switch enabled (how please?); can the x64 ones use as much as they need/can get?

Thanks

System:

Sony VAIO VGN-NR280E

4GB DDRII PC2-5300 667 RAM

Mobile Intel 965 Express Chipset Family

Core 2 Duo 1.7 GHz CPUs

Intel GMA X3100 Video (c. 300-400MB RAM usage)

Answer 1

Memory allocation is set automatically.

If a 32-bit application is compiled with the IMAGE_FILE_LARGE_ADDRESS_AWARE switch set it is allocated a 4GB address space in 64-bit Windows. If not, it is allocated 2GB.

For 64-bit applications, if IMAGE_FILE_LARGE_ADDRESS_AWARE is set when compiled - the default is set - it can use up to 8TB. If IMAGE_FILE_LARGE_ADDRESS_AWARE is cleared it can use up to 2GB.

Answer 2

I have 8GB ram 4+4. windows 7. it say installed memeory 8Gb (usable 3.15). and i really having problem that amount ram, so what can i do to use all memroy.

Thank you for future replay

Answer 3

This tread is very old, over three years.

You should really start a new thread.

However, do you have Windows 7 x64 (64 bit)?

If not, then you are limited to about 3GB of RAM.

Answer 4

When i have Windows8 (could not remember 32 or 64bit), i had same problem and i removed a driver which i had installed from samsung website then its fixed, it seems i need to re-install windows.

Thank you for your replay

Answer 5

This tread is very old, over three years.

You should really start a new thread.

However, do you have Windows 7 x64 (64 bit)?

If not, then you are limited to about 3GB of RAM.

Haha, he who knows not of what he speaks....................