8GB Ram installed, 3.96GB RAm usable, Windows 7 64-bit

[pipper47]

Hello guys,

I have recently bought
Kingston 8GB KIT DDR3 1600MHz CL10 HyperX Fury Blue Series ... when I replaced my old RAM with them (they are 8GB too), Windows tells me there is only 3.96GB RAM usable.

- Yes I have 64-bit Windows. With my old RAM there was no problem. I had 8GB usable.

- In the msconfig I have unchecked maximum memory size

- I tried both channels

- I have tried running memcheck and it didnt find any errors

I would appreciate your ideas. Thank you guys

btw my specs:
CPU- AMD FX-8350
GPU- ASUS GTX970
PSU- Corsair RM650
Motherboard - GIGABYTE 990XA-UD3
RAM - Kingston 8GB KIT DDR3 1600MHz CL10 HyperX Fury Blue Series
HDD - 3,5" 7200RPM 1TB
SSD- Intel 120GB
OS - Windows 7 Ultimate 64-bit

 

[bootcher]

Did you try to boot with only 1 stick installed? And tried this with both sticks?

 

[juanjostorreshernndez]

It maybe a windows misreading, so play some RAM demanding game like Call of duty AW and see what happends.
also use AIDA64 for better memory use details at mobo section in it.

 

[pipper47]

Did you try to boot with only 1 stick installed? And tried this with both sticks?

I dont know why I didnt think of that. One stick is fine, but with other PC wont boot, so it appears that one RAM is faulty. Thank you But why even windows recognized there is 8GB Installed? And why did the memcheck didnt find any errors?

Thanks for your quick response

 

[jitpublisher]

This may sound odd, but actually the stick needs to work, but throw errors for memtest to find a fault. If it flat does not work at all, then memtest may not even know the stick is there.

 

[bootcher]

It can recognise the module when it is installed but not used by the OS, but when used it will fail.