PC only uses 3,6GB RAM while 5GB installed on x64 system

roel5131

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Well i know there are many threads about this issue but im not gonna read them all, so far ive not found the someone with my exact type of problem.

Im gonna try to explain it as best as i can.

you know what is written in the tilte so here we go.

first of all on my PC ive had always windows 7 Ultimate x64.

the problem started when i lost my raid 0 setting because ive had overclocked my CPU too much and my pc would't boot anymore. so i had to reset the BIOS and with that i lost Raid 0 and ofc my windows installation. I thought my CPU was broken as well because from then my PC was very unstable and constandly freezing.
so i bought a new CPU an older one a Intel Pentium D as you know less fast then the newer Dual cores.

Ive installed the Intel Pentium D and i put a new Graphics card in too because that was causing the Freezes.
The Pentium D could use the full 5GB on Windows 7 Ultimate x64 but was slower. I got from a Friend a Intel core to Duo at 3.6 ghz, so i installed that CPU. But when i got in to windows i saw only 3.6 GB was usable of my RAM. Never touched my RAM setting.

I find it strange that a older CPU can use 5GB of ram and a newer CPU only can use the 3,6 GB

Well i thought im gonna install my old Intel core to DUO that i thought i had destroyed by a faulthy overclock. But it works just fine, but also i can still not use the full 5GB of Ram but the strange part is that this CPU is the one that first accepted 5GB and now only 3,6 GB.

So what could cause this? it this windows Related?
 

My Computer My Computer

At a glance

windows 7 ultimate x64
Computer type
PC/Desktop
OS
windows 7 ultimate x64
sure that the rest of the ram isn't used by a ram-less onboard graphics card?
 

My Computer My Computer

At a glance

Windows 7 Ultimate x64Xeon E5-1650 v2Kingston ECCQuadro fx 580
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Windows 7 Ultimate x64
CPU
Xeon E5-1650 v2
Motherboard
Asus p9x79 ws
Memory
Kingston ECC
Graphics Card(s)
Quadro fx 580
Hard Drives
Samsung 850 pro
Corsair Force Gt
Seagate Enterprise 6TB on 3ware 9750
Antivirus
avira
My motherboard has no onboard graphics card.
 

My Computer My Computer

At a glance

windows 7 ultimate x64
Computer type
PC/Desktop
OS
windows 7 ultimate x64
Open Resource Monitor, switch to memory tab and post a screenshot please.

Most likely a misconfiguration of RAM. Try changing the slots, and changing the RAM to auto timings.
 

My Computer My Computer

At a glance

Windows 7 Ultimate x64 SP1AMD Phenom 2 1090T2x8GB Kingston HyperX Fury Black 1600Mhz Unga...MSI GTX 970 Gaming 4G
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Windows 7 Ultimate x64 SP1
CPU
AMD Phenom 2 1090T
Motherboard
Gigabyte GA-890FXA-UD5
Memory
2x8GB Kingston HyperX Fury Black 1600Mhz Unganged
Graphics Card(s)
MSI GTX 970 Gaming 4G
Sound Card
Realtek On-Board HD 7.1 Audio / Logitech G35
Monitor(s) Displays
3xAcer GD245HQ
Screen Resolution
1920x1080
Hard Drives
Samsung 850 Pro 512GB SSD - OS /
WD Caviar Black SATA 3 - 1 TBx2 - Dynamic RAID 0 /
WD Caviar Green SATA 2 - 640GBx2 - Dynamic RAID 0 /
WD Caviar Green SATA 2 - 640GB - Internal Backup /
Seagate Barracude SATA 3 - 3TB - External Backup/ Sync
PSU
HighPower 1000W
Case
Cooler Master HAF 932
Cooling
Noctua NH-D14
Keyboard
Logitech G19
Mouse
Logitech G500
Internet Speed
100/4 Mbit Cable (100GB quota)
Antivirus
ZoneAlarm Extreme Security / MBAM Pro / MBAE Free / SAS Free
Browser
IE 11 - Firefox - Chrome
Other Info
Logitech F710/ G27/ G940/ Z5500 // TrackIR 5 // Nvidia 3D Surround Vision
also your ram was misconfigured from the start. you can't have 5 gigs in a dual channel setup.
use 2 identical sticks, not three.
 

My Computer My Computer

At a glance

Windows 7 Ultimate x64Xeon E5-1650 v2Kingston ECCQuadro fx 580
Computer type
PC/Desktop
Computer Manufacturer/Model Number
Custom Build
OS
Windows 7 Ultimate x64
CPU
Xeon E5-1650 v2
Motherboard
Asus p9x79 ws
Memory
Kingston ECC
Graphics Card(s)
Quadro fx 580
Hard Drives
Samsung 850 pro
Corsair Force Gt
Seagate Enterprise 6TB on 3ware 9750
Antivirus
avira
when i build my pc, i could use the whole 5GB and its not in dual channel, its in flexmode.
 

My Computer My Computer

At a glance

windows 7 ultimate x64
Computer type
PC/Desktop
OS
windows 7 ultimate x64
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