Bios/Win10 Listing Higher Memory than Installed

[Shaitin]

I upgraded my wife's desktop memory last night, as she had a bad stick. I put in a new pair of 8G DDR3 2133 sticks. The BIOS initially posted them at 1333MHz, but it was reading 24G of memory rather than 16G.

I am familiar with using XMP or alternate memory profiles to get the clock speed correct, so I tried switching it. I was able to get the clockspeed up to 1866MHZ, but now the system is registering 20G of memory (still not 16G).

At first I thought maybe I just got a mislabeled pair of memory, but after adjusting the frequency caused the total installed to decrease I am at a complete loss as to what is going on. I've asked around a bit and nobody seems to have ever heard of anything like this. I don't want my system to start crashing if it starts trying to address memory that is non-existent.

MOBO: Gigabyte X79-UP4
Memory: Corsair Vengeance Pro DDR3-2133

 

[Myself11]

You could try filling up the RAM with some stresstest tool, or run memtestx86 over it. The fact that it got down to 20total after you increased the freq is surely strange though. Maybe memtest will be able to help you with that. Else, I'd personally try to RMA the new stick of RAM, or borrow an other stick from someone to see if it's a mobo or RAM issue.