Had memtest errors, bought new mobo, now keyboard errors and same memtest errors. Could it be my cpu? or all my ram?

[gregsteg]

I have been trying to troubleshoot an unstable system for a few months.

I have an AMD system setup as to dual boot with ubuntu and windows 7 64bit, each on separate SSDs. I have been getting occasional BSODs for a long time in windows which is what I primarily use, but these got more and more frequent and I noticed system hangs in ubuntu which led to me trying to diagnose this as a hardward issue.

Lo and behold, I got plenty of errors in memtest (the one from the ubuntu boot menu).
I have 12Gb of RAM across 4 sticks, 2x4Gb and 2x2Gb. I systematically went through them and got errors from all sticks in different slots. I assumed the chances that all my memory is bad were slim (maybe the bad assumption here considering how cheap the kits were).

The tech at the local computer shop figured memory errors from hardware shouldn't come from the CPU in an AMD setup. I believed him at the time, but is this true?

I bought a new motherboard and transferred everything, but now the system is more unstable than ever, I can barely boot to either OS and they hang and give plenty of different errors. I also get keyboard errors nearly half the time I reboot (which is often as I troubleshoot this).

cpu- AMD FX-8350
mobo old- ASRock 970 EXTREME3 ATX
mobo new- Gigabyte 78LMT-USB3 AMD760G mATX
PSU - 620 bronze seasonic
GPU- Cyclone N460-GTX
memory-
patriot G2 series (PGD38G1333ELK) (2x4G ddr3 1333 MHz 9-9-9-24 1.65V)
adata gaming series AX3U1333GB2G8-2G (2x2G ddr3 1333MHz 8-8-8-24 1.55-1.75V)

I wanted to ask for suggestions before I go pulling RAM and PSU out of another computer, or sending the cpu in for an RMA, or returning the new mobo.

 

[leo2kp]

I couldn't tell from your testing methodology - did you test each stick individually, or just switch them around to different slots?

 

[leo2kp]

Additionally I would say that the tech could be wrong here. AMD uses an integrated memory controller on the CPU, so any issues with that could result in memory errors.

If you haven't tested them individually, try it. If they come out OK then the issue is probably the fact that you are trying to mix completely different memory modules together. I would also try testing each kit individually.

 

[gregsteg]

Thanks for asking me to clarify that. I tested each stick individually. First in their original slot, and then each individually in the slot closest to the cpu. I initially found one stick that failed in both slots and the others had passed all tests. After that I took out that pair with the one stick that failed put the two sticks from the other kit back in and things were stable for about a day and then I got BSODs and errors in from the 2nd kit. I then got more systematic and tested pair by pair in either set of channels and got failed tests.