Windows 7 cannot see 4GB ram

Hello hqt,

The missing 1GB fo RAM is most likely allocated in your BIOS settings to be used by the integrated graphics chip. This is not unusual. :)

Hope this helps,
Shawn

This gives some explanation. And the problem is not RAM per se, the problem is Address space. A lot of components in the system need that and thus it is not available for RAM.

hqt said:

I have a laptop. I know that windows 32 bit version just see max 4GB address (video card+ graphic card+ ram...) . My laptop is doesn't have graphic card, and have 4GB ram. So, I think windows can use all of my Ram. but windows notice that just 3GB usable. Who can answer for me, please.

thanks :)

As Brink noted, some onboard chips have minimal memory and use the system ram for video ram. Also the system has to map part of the address space as video ram. If the graphics is set to use 512 MB then the memory mapping + system ram used by video would add up to 1 GB. Unless my understanding is wrong. Maybe a system builder can chime in. But I think since the address space of 32 bit Windows is 4 GB total you cannot address the same ram as both accessible by the system and as video memory. Therefor 512 MB x 2 is a gig.