available physical memory lower than total

Microsoft claims that it is not their fault and is instead a limitation of the 3. This is a known limitation of the Windows Vista and 7 x. 2 bit editions of Windows will display less than 4 GB of memory. But, what if you have more than 4 GB RAM? Even on a system with 3. Depending upon your hardware, anywhere between 2. MB depending upon the graphics adapter.ĭue to this Windows always displays less than 4 GB RAM as the amount of usable memory. For example, PCI Express support will reserve 2. So, where did the remaining memory go?Īs it turns out, chunks of your RAM are reserved for various purposes and are not available to the operating system.

GB but at the same time stated that only 3 GB is usable. Computer Properties displayed installed memory as 4. GB or more RAM then you are probably familiar with the following screen. GB of RAM, Windows refused to use more than 3. But, I had another minor niggle to figure out. Couple of months back, I had blogged about a peculiar Windows 7 issue which could cause a BSOD (Blue Screen of Death) if the system had 4. Unless explicitly mentioned, Windows 7 and Vista refers to the 3.

Available physical memory lower than total