Memtest86+ errors on my freeNAS server build!

[Uter]

So I'm testing the hardware on a freeNAS server build, and that's my problem.

Here are the hardware specifications right now:

ASUS M2NBP-VM CSM
- (35 degrees Celsius after 11 passes on Channel B)
- enabled ASUS Q-FAN2 for my Channel A run, and temperature was 40 degrees Celsius before I started

AMD Sempron 3000+
- (38 degrees Celsius after 11 passes on Channel B)
- enabled ASUS Q-FAN2 for my Channel A run, and temperature was 45 degrees Celsius before I started

CORSAIR XMS2 TWIN2X2048-6400 2GB 2X1GB PC2-6400 DDR2-800 CL 5-5-5-12 Matched Memory Pair
- Memtest86+ 1.70 says 5-5-5-18 and my DDR2 Voltage Control is manually set to 1.9V

And that's it. I have not added my USB Storage Device or any other Hard Drive except for the CD-ROM Drive I'm using with the Memtest86+ ISO.

I had 39 errors after 11 passes on Channel B, but none after 12 passes on Channel A. Does this sound like a memory or motherboard problem to you guys? Is this even something I should worry about, if I leave my memory in Channel A?

EDIT: My power supply is a CORSAIR CMPSU-620HX.

 

[Quiksilver]

Sounds like memory but if you really want to make sure swap out the good stick, stick in the bad stick. Run memtest again, if errors are still there its the stick and not the ram.

 

[Uter]

I'm honestly not sure which one is bad. Now that I haven't seen any errors with these running together in DIMM_A1 and DIMM_B1 (Channel A), I might as well run Memtest86+ on each individual stick in DIMM_A1. Doesn't the fact that these went error free in Channel A lead you to believe that this is a motherboard problem though?

EDIT: Should I have posted this in the CPU/Motherboards section instead?

 

[Quiksilver]

Nah, I think this section is suitable.

and yeah that is what I would assume if both sticks pass. Considering you got this for free, a few problems here and there shouldn't be too much to fuss over