RAM slot B1 not showing

Raptor Computing Systems Hardware > Blackbird

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bw42:
The system says something is there, but it doesn't show the size.
I didn't notice any errors on boot.

I swapped the modules around to see if it worked with the one that wasn't detecting and it works fine in the A1 slot.

I've read some systems use half the RAM for ECC, so you can only use half of what is installed.
Does the Blackbird do something like that?

ClassicHasClass:
No. My Blackbird has its RAM stick in B1 and sees all of it. What type of RAM?

cchinicz:
Hi,

My Blackbird came with 16GB (Samsung) on the back slot (relative to the user seating in front of the computer). I've bought another 16GB from Crucial (CT16G4RFD8266 16Gb Ddr4-2666 Rdimm, 16 Gb (1 X 16 Gb), Ddr4 Sdram, 2666 Mhz Ddr4-2666/Pc4-21300, 1.20 V, Ecc, Registered, 288-Pin, Dimm) installed it and it worked for a few days.

Then it stopped worked and I've tried all combination front/rear slot samsung/crucial and found that both sticks work on the front slot but not on te rear slot, giving me only 16GB. Neither work on the back slot alone and I suspect the back slot is not working or there is some firmware issue that was triggered when I added the additional stick on the back slot.

I opened a support ticket on Raptor (my machine is brand new and came with a defective power supply, which took a month to be replaced). It seems your issue is similar to the one I'm experiencing.

Have you opened a ticket with Raptor?

Regards

bw42:
The RAM I bought is Micron 2x32GB DDR4-2400 ECC Registered.

The system picks it up and works with either module, as long as its in A1.
Just doesn't pick up the module in B1.

So that's disappointing.

cchinicz:
Oh. I forgot to mention: I had asked support about the memory I was intending to buy (Crucial) and they replied that it should work with the memory stick that came with the machine (Samsung).

Have you checked this link: https://wiki.raptorcs.com/wiki/POWER9_Hardware_Compatibility_List/Memory ?

Regards

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