Server memory problems

[Erich Dollansky]

Hi,

On Tuesday 17 July 2012 06:45:18 Andy Young wrote:
> I am having trouble with one of our servers and I'm not sure what to try
> next. It has a Supermicro H8DGi-F motherboard with two 16-core AMD
> processors and two memory banks, one for each processor. When I originally
> built it, I only had one processor and 40 GB of ram. Everything worked
> awesome. I recently upgraded it, adding another processor and another 40 GB
> of ram. It was incredibly unstable and constantly rebooted within minute or
> two of uptime, sometimes it wouldn't even boot all the way before crashing
> and rebooting again. Seemed like a memory issue so I scaled it back to two
> processors and 32 GB (4x8GB) of ram. Worked well so I added the remaining 8
> GB sticks I had, bringing it up to 64 GB. Still worked great. The sticks I
> had left were a mix and match variety of 8GB and 4GB sticks. Thinking maybe
> there was some problem with mixing them, I ordered more 8GB memory just
> like the ones in the box. While waiting for the new memory, the machine
> performed great with no issues. New memory arrived and I added two more 8GB
> sticks. Immediately the constant crashing returned. It seems really
> unlikely that I got bad memory in two separate orders. Does anyone have any
> other ideas? Again, its perfectly stable with two processors and 64 GB of
> memory but goes nuts when I more.
> 
could it be caused by the power supply?

Did you run a memory test?

If possible, try different power supplies.

> I really appreciate the help!!
> 
> Motherboard: Supermicro H8DGi-F
> CPU: 2 x AMD 6274 (2.2 Ghz 16-core)
> Memory: Kingston 8GB DDR3 1333

No ECC?

Erich