full build:
DDR3 Kingmax 2+4 GB 1333
amd R7260x
AMD fx-6300
ASUS M5A78L-M LE
FSP Raider 550
<span style="font-size: 14.4799995422363px;">HDD: SAMSUNG HD502HJ
Hey!
There are two RAM sockets on my motherboard (ASUS M5A78L-M LE) I use 2 RAM modules, like 2+4GB, both on 1333Mhz.
It has worked me fine for years, till a month ago, when I installed a new CPU (AMD fx-6300). Since that, I had to realize my computer just uses the left ram module. If I put the 4GB to the left, than I have 4, if I put the 2GB in the left, than 2.
If I only install memory to the right socket the computer can't even boot.
The tricky thing is, programs still can detect my second RAM module. HWinfo for example sees them perfectly. And even the Windows (win7 service pack1 64 bit) says: Installed memory (ram): 6GB (4GB useable).
The Memory Diagnostics Tool can't find a problem.
Any ideas? It's the memory? Or the board? Or software?
Screenshot (sry for the Hungarian windows
):
<span id="INSERTION_MARKER">http://s24.postimg.org/y66b1qsyt/ram_***.jpg
Thanks!

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