8GB but for use: 4GB...

[SynthisizeR]

Hello! I changed from 4(2x2) to 8GB (2x4) Rams last x-mas. Tho I noticed before some hours that I got usable ram 4gbs only...Where at? Read below..
-My computer~>Prop~>Installed ram: 8gb(avaiable for usage 4)
-Task Manager~>Performance~>Memory 4GB..
-msinfo32.exe ~> Installed ram 8gb / For usage: 4gb
-Bios~>Ram for usage 4000mb(aprox)
-Memory gadget on desktop: size: 4000mb...
BUT..CPU-Z Memory tab says Memory size : 8192 mb..

So what's going on?
I 'll tell you what I've tried so far but nothing changed..
i) Memory remap on bios in enabled.
ii) msconfig , max memory is unticked [ ]

Any ideas?://
Thankful for any answer!

PS: Till last xmas I've done like 2 or 3 formats , and Im fully cleaning my comp once a month.(via antivirus , cant defrag cause I use my ssd(C:/) where my windows are installed)

-----PC SPECS----
TOWER: CoolerMaster HAF XM
* OS: Windows 7 Ultimate 64bit *
•CPU: Intel Core i5 750 Lynnfield - 2,6GHz(OCed @3,2GHz) , 8MB Cache , 4 Cores , 4 Threads
•Cooler: CoolerMaster Hyper 412S (1300rpm)
•RAM: Corsair Vengeance 8GB(2x4) GB DDR3 1666 MHz(8-8-8-24 Timing)
•HDD: 1 TB Sata II 7200 rpm
•GPU: Radeon HD 5770 , 1GB
•SSD: 120GB Samsung 840Series (480MB/s Read Speed-130MB/s Write Speed)
•MoB: ASUS P7P55D
•PSU: Premier 850W

 

[MC_K7]

http://imageshack.com/a/img15/531/e5ly.png Well here is my system type...
Λειτουργικο συστημα=Operating system , 64bit.
***
Εγκατεστημενη RAM=Installed RAM
Δυνατη η χρηση=Usable
***
Im gonna default the bios and boot the latest version thru a usb now..

Thanks for confirming.

I hope that flashing your BIOS to latest version and resetting to default settings will fix your issue.

 

[SynthisizeR]

Okay guys thanks for helping.
I'll check it out!