Lenovo ThinkStation S20 memory high strangeness

[Fritz]

Upgraded an S20 and added a Dell H310 to get 6GBs. Box has 24GB of Ram and after installing the H310 it had 16GB of Ram. It didn't click right away so I went off into the wilderness troubleshooting a memory problem. I narrowed it down to the 2 middle memory slots. Memory installed in them did not register hence the 8GB drop. After taking a break and thinking about it for a minute it dawned on me that the H310 must be the cause. Sure enough it was. i removed it and memory was once again 24GB. I shuffled the slots around and no joy. With the H310 installed I lose 8GB of Ram.

Anybody know what's going on here?

TIA

 

[Terry Kennedy]

Anybody know what's going on here?

SMBus on PCIe pins B5/B6 is interfering with SPD detection in those sockets. Don't belive people who tell you the only way an SMBus problem can manifest is a completely dead system...

 

[Fritz]

SMBus on PCIe pins B5/B6 is interfering with SPD detection in those sockets. Don't belive people who tell you the only way an SMBus problem can manifest is a completely dead system...

Thank you sir. so I can safely assume that it won't work? No big deal, I'd like to to have 6GBs but it's not a deal breaker.
Or maybe another HBA would work?

 

[Terry Kennedy]

Thank you sir. so I can safely assume that it won't work? No big deal, I'd like to to have 6GBs but it's not a deal breaker.

You can just carefully tape over those two pins.

Or maybe another HBA would work?

A generic LSI/nom-de-jour card should work. OEM cards tend to have minor design changes like this.

 

[Fritz]

Thanks