DIMM slot stops working when Dell H310 is in PCIe slot

[Herdo]

I noticed unRAID and BIOS were only recognizing 4gb of my 8GB (2× 4GB) of memory. Checked both sticks and they were fine. Then I checked the DIMM slots and one was not working.  I remembered seeing 8GB in the BIOS early so I tried various things to troubleshoot.

 

Sure enough,  when I remove my Dell H310 (flashed to LSI) all DIMM slot works perfectly.

 

I've been poking around in the BIOS for hours, but I'm not finding anything helpful.  I also tried posting this on a more traditional tech support forum but it hasn't gotten any responses.

 

My motherboard is a SUPERMICRO X11SSM-F and it's got the latest BIOS.

 

2× 4GB DDR4 2133Mhz Unbuffered ECC RAM.

 

Intel G4400.

 

unRAID 6.19

 

Any advice,  or even wild guesses would be appreciated.

[JonathanM]

Wild guess, something to do with the card's BIOS? Maybe the memory that the card wants is mapped to some of the system RAM space?

[digitalfixer]

On the H310 you need to cover pads b5 and b6 with some tape. I have two of these cards and they both caused that problem until I did the tape trick.

 

More information here.

 

http://lime-technology.com/forum/index.php?topic=29236.msg262090#msg262090

 

http://www.vladan.fr/memory-channel-per-bank-getting-non-active-when-using-perc-h310-contoler-card/

 

http://yannickdekoeijer.blogspot.co.uk/2012/04/modding-dell-perc-6-sas-raidcontroller.html

 

Kevin

[Herdo]

HA!  I knew I should have asked here first.  I was pretty sure I wasn't the only person encountering this problem but my google-fu failed me on this one.  Thank you digitalfixer, you've lived up to your name!

 

And thanks for the reply jonathanm.