Windows only using 4 gigabytes of RAM, have single 8 gig stick installed?

Dancerfool

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Jan 23, 2012
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18,510
Maybe I'm being stupid, but I'm not sure Windows is using all of my RAM. In dxdiag, speccy, and everywhere else I've checked, Windows sees me having a single stick of 8 gigs of RAM, but in task manager the information is contradictory.
When I was running Fallout 4, it was stuttering, and I checked, and task manager claimed to be using about 90% of my ram, but all together there was only about 3.5 gigs in use in the processes tab. After closing Fallout and looking around I saw that in my performance tab it's holding extremely steady at 5.1 gigs of memory use, despite the fact that I'm only running chrome, skype, and steam. Now that I'm running only that, the processes tab says it is using about 61%, despite only having about 700 mb usage apparent.
I'm using Windows 10, 64 bit, and this is a relatively new computer that I built from scratch. Am I being stupid, or is it actually weird that my system is using 5.1 gigs of ram when I'm doing barely anything?
 
Solution
DDRx memory is designed to work in pairs, they alternate processing data. You should have 2-4GB memory modules installed in the correct pair of sockets (this varies) to reach 8GB. You may have exceeded the single slot capacity of your chipset. Also video cards use memory from the last address down, don't be surprised if an amount equal to your GPU memory is missing from your O/S memory. Some very new boards use sets of 3 modules.

ddpaulb

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Apr 21, 2014
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What cpu do you have?
With 4 tabs in Chrome and Steam my Win 7 64 task manager performance tab shows 2.5gb.
 
DDRx memory is designed to work in pairs, they alternate processing data. You should have 2-4GB memory modules installed in the correct pair of sockets (this varies) to reach 8GB. You may have exceeded the single slot capacity of your chipset. Also video cards use memory from the last address down, don't be surprised if an amount equal to your GPU memory is missing from your O/S memory. Some very new boards use sets of 3 modules.
 
Solution

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