help! installed new motherboard now i'm missing RAM

Hi all im new to this forum and looking for a little help . around 6 months ago my pc motherboard/processor died. i acquired a new one from flee baye, motherboard and processor package and set about repairing pc . i noticed then that my pc wasn't showing all the ram (i had 8GB) installed and now was showing 5 .does any of you wizzkids have any idea what i have done wrong or what i need to do , iv lived with it until now but some games are just not working with low ram ,

so far iv done :

checked ram are seated correctly and in right order (i have 2x2GB and 1x4GB)
looked around in bios and cant see anything
reset cmos
done a windows memory diagnostics or what ever its called and all cam back clear

this is what it says pleeeeeeese help

Version 6.1.7601 Service Pack 1 Build 7601
System Manufacturer Gigabyte Technology Co., Ltd.
System Model GA-78LMT-USB3
System Type x64-based PC
Processor AMD FX(tm)-8350 Eight-Core Processor, 4000 Mhz, 4 Core(s), 8 Logical Processor(s)
BIOS Version/Date Award Software International, Inc. FA, 23/04/2013
SMBIOS Version 2.4
Installed Physical Memory (RAM) 5.00 GB
Total Physical Memory 3.48 GB
Available Physical Memory 1.11 GB
Total Virtual Memory 6.96 GB
Available Virtual Memory 4.89 GB
Page File Space 3.48 GB

Mellon Head said:

What happens if you take the 2x2 sticks out. Do you get 4 GB then?

I'm wondering if the mobo is incompatible with that mixture of RAM...

Installed Physical Memory (RAM) 2.00 GB
Total Physical Memory 1.72 GB
Available Physical Memory 440 MB
Total Virtual Memory 3.43 GB
Available Virtual Memory 2.00 GB


thats with the 1x4GB installed only

Layback Bear said:

First off a mismatch of ram can always cause problems.
I would suggest suggest downloading the motherboard manual and installing the ram suggested and in the position the manual indicates.

Here is a little starter look. The manual will give more information.

GIGABYTE - Motherboard - Socket AM3+ - GA-78LMT-USB3 (rev. 4.1)

1. 4 x 1.5V DDR3 DIMM sockets supporting up to 32 GB of system memory (Note 1)
2. Dual channel memory architecture
3. Support for 1600(O.C.)/1333/1066 MHz memory modules

(Please refer "Memory Support List" for more information.)

You could also have a eBay reject product.

ill look into that mate when i buy some new ram thanks for the reply

Installed Physical Memory (RAM) 4.00 GB
Total Physical Memory 3.48 GB
Available Physical Memory 2.37 GB
Total Virtual Memory 6.96 GB
Available Virtual Memory 5.77 GB
Page File Space 3.48 GB

this is with 1x2 and 1x4

Installed Physical Memory (RAM) 3.00 GB
Total Physical Memory 1.72 GB
Available Physical Memory 710 MB
Total Virtual Memory 3.43 GB
Available Virtual Memory 2.32 GB
Page File Space 1.72 GB

this is with the other 1x2 and the 1x4

thanks guys ill try that , iv run that software and noticed that the gskill one is showing 2GB and not 4GB could this be down to voltage or clock speed ? i know nothing about either but read about them somewhere