If your PC has trouble recognizing
How to Fix 'All RAM GB Not Usable' Issue in Windows 10/8/7
Your computer’s hardware and Windows 7 limit the amount of memory your computer can use. In the case of 32-bit operating systems, that limit is 4GB of RAM. 64-bit operating systems can use much more. However, if your Windows 7 64-bit PC is having trouble recognizing all of the RAM in your computer, there is a quick fix that might work. Learn how to fix the maximum amount of RAM Windows 7 64-bit can use.
Many users of the 32-bit version of Windows 7 were disappointed that not all of their 4GB of RAM (or more) could actually be used by the operating system. Many opted for the 64-bit version of Windows 7, but still had trouble getting the operating system to recognize and use all of the memory installed in the PC.
Normally, your computer’s hardware and Windows 7 work together to identify the hardware in your PC. This includes the memory or RAM that you have installed. Sometimes, your computer doesn’t know what you have and may report that you have less RAM than you actually do. Assuming this isn’t a hardware error or malfunction, there is one trick you can try.
