Installed RAM? Answered

You need to check if you have a 32 bit (x86) or 64 bit (x64) version of Windows 10, you can do this by right-clicking the windows on the taskbar then left-clicking system.This will bring up the 'System Properties' window, under the 'system' heading it will indicate if it is 32/64 bit. Note that due to memory addressing limitations, 32 bit software only supports up to 4Gb.

Regardless of the O/S version, your system BIOS should detect how much RAM is physically installed, this is often indicated on the POST boot screen at startup.

It is important that you select the RAM type that is compatible with your laptop, memory is available in different types, clock speeds etc. While all the memory modules don't necessarily need to match in terms of size, the RAM type and speed should be the same.

If you visit the following site "Mr Memory" and select the make/model of your laptop, it will tell you what RAM is compatible with your hardware and what the maximum amount of supported RAM is, hope this helps.

Ram will not report if there are different denominations. Ie. You can't have an 8GB stick and a 4GB stick together. Most specialists and experts will utilize the same exact brand as well to ensure compatibility. If you have four RAM slots, you should check to see what the maximum RAM your device is compatible with and split that EVENLY into four slots (if you have four RAM slots). The key is, the RAM must be evenly split.

Do you have a 64 bit system? With a 32 bit system, you can't address more than 4GB.

some BIOSes and EFIs will tell you how much RAM is detected. I have 24GB, 2 8GB sticks, and 2 4GB sticks. Strangely it is detected as dual channel although the RAMs have different capacities and timings. :)

How much RAM is the system reporting http://windows.microsoft.com/lo-la/windows-vista/find-out-how-much-ram-your-computer-has?