Win8.1 system installs 4GB memory but only 2GB memory how to do?

Win8.1 system installs 4GB memory but only 2GB memory how to do?

Workaround:

1, first of all to determine your motherboard model, so that the BIOS manufacturer. The BIOS manufacturer of the motherboard determines the settings differently.

To set the method:

1, Boot press F2 or DEL key into the BIOS;

2, find Northbridge/chipset features/advanced chipset features/peripheral settings of this category of the name of the item, enter;

3, find intergrated graphics/built-in graphics/This item, pay attention to not graphic sequence this setting;

4, find the buffer size/shared memory this kind of setting, not modified before the general value of this item is auto, enter, in the Drop-down menu to choose their own size.