(Solved?) Help me troubleshoot a new build (memory problem?)

[Knavish]

Update:
Last night, I noticed the memory was running in unganged mode by default. I switched the memory config to run in ganged mode & reran Memtest. Memtest ran for ~7hrs with no errors.

I think:
unganged = non-interleaved, 64 bit memory access
ganged = interleaved, 128 bit memory access

I wonder if MSI's tech support would be able to comment on this...
----------------------------------------
Original message
I've put together the following system:

CPU: AMD Athlon II 620
Motherboard: MSI 785gm-e65
Memory: GSKILL Ripjaws 2x2GB DDR3-1333
PSU: OCZ ModXstream Pro 500W
OS: Win7

FWIW, the CPU seems to be near-idling at 42-45 C when this happens.

Now that the machine is updated and I've started to use it more heavily (multitasking in windows, haven't even tried a game yet), I'm getting frequent "Memory management" blue screens.

Trouble shooting steps so far:
1. Updated the BIOS to the latest version, used the "Load Failsafe Defaults" option for system settings.

2. I installed a single stick of memory & ran Memtest. It ran for ~8hrs with no errors. I swapped it for the 2nd stick of RAM, which also ran for ~8hrs with no errors.

3. Next I installed both sticks of RAM & ran Memtest. Lots of errors in the 500-600MB range within a couple minutes. (According to the manual you install 2 sticks into slots 1 & 2 for dual channel operation, so that's how I installed them.)

Question(s):
Would you conclude the motherboard is bad?
Since the memory controller is in the CPU, is it possible that the CPU is bad?
RMAing the motherboard to Newegg would be faster / better than returning it to MSI, right?

Thanks in advance for your comments.

(edit(s): adding info based on people's questions

 

[Patrickz0rs]

Shot in the dark but are both sticks in the same colored slots?

 

[onza]

Not that it matters - specs on Power supply?

Is the mobo picture..
http://images17.newegg.com/is/image/newegg/13-130-233-S01?$S640W$

Kind of like patrick said - how are you putting in your memory sticks in which banks?

 

[Knavish]

Shot in the dark but are both sticks in the same colored slots?

I did it the way the manual shows in the diagram (Slots 1 & 2). The wording is a bit strange, but I'm assuming that Slots 1 & 2 are two different memory channels -- so Slots 1 & 3 are channel 1, Slots 2 & 4 are channel 2...

 

[Knavish]

Not that it matters - specs on Power supply?

Is the mobo picture..
http://images17.newegg.com/is/image/newegg/13-130-233-S01?$S640W$

Kind of like patrick said - how are you putting in your memory sticks in which banks?

Yeah that's the board. I've got the memory in the two black slots.

 

[Knavish]

Not that it matters - specs on Power supply?

Is the mobo picture..
http://images17.newegg.com/is/image/newegg/13-130-233-S01?$S640W$

Kind of like patrick said - how are you putting in your memory sticks in which banks?

500W OCZ

... I'm updating the 1st post with info as you guys add questions.

 

[Pederv]

Have you tried giving the memory voltage a little nudge?

I had to do that with the Muskin that I have.

 

[Knavish]

Have you tried giving the memory voltage a little nudge?

I had to do that with the Muskin that I have.

Yeah I suppose I could try that. It must be burried in those 1000 different RAM BIOS settings somewhere.

It seems pretty crappy that I'd have to change a voltage on the RAM manually when I've got the BIOS set to "Failsafe Defaults". You'd think the RAM specs in the SPD would do the trick. It doesn't even run at the 8-8-8-24 (as I recall) listed spec normally. It defaults to 9-9-9-something.