I bought a used motherboard,cpu,ram. M5A78l-MX-V2[latest bios], FX6300, 2x4GB Mushkin.
It came up saying I had around 4GB in 64bit Linux. I assumed he had made a mistake about the ram and it was
2x2GB; I hadn't had a look at the ram before I stuck the board in the case and I have a bit of a whopper of a case
which is stuffed in the corner[pain to drag it out to look].
I complained about the ram and he assured me it was 8gb, "run memtest".
The bios said 4096MB and it posted with 4096, but memest had: "SPD information": 2 pieces of 4096MB but
memory available: 4078MB, and it only ran to 4078MB in it's tests!
Then I was using it a few days later and noticed I had 7.8GB of ram available. Bit more fiddling and it seems if I
watch the post screen and hit ctrl, alt delete if it says 4092 it will eventually say 8192, then linux will say I have
7.8GB of ram and memtest will test it all. I tried reseating each stick and swapping them over, made no difference.
Anyone any idea of what it could be?