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rbowman1234
2 Posts
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1734
February 2nd, 2019 12:00
Precision 690 w/memory risers booting in single channel mode
Good afternoon. I searched the general desktop forum for an answer to this but didn't find anything.
I have a Precision 690 with a set of memory risers. I have verified that they are properly configured with 4 sets of matching fully buffered 4GB DIMMs, but when I boot, I get an error message that it is booting in single channel debug mode. When I hit F2 and look at the memory menu, it shows that all 16 4GB DIMMs are present, but only 8GB is available.
I bought this refurbished from my university with mismatched DIMMs on what turned out to be risers that weren't fully functional. I replaced the risers and memory. Is there an additional step I am missing to take the machine out of debug mode?
1532
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Posted February 15th, 2019 20:00
Thank you for the reply. That doesn't help. I have all 16 slots filled, and when I view the memory after striking F2 in debug mode, it shows every slot filled but still only boots in single channel debug mode.
1524
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Posted February 16th, 2019 02:00
Hi @rbowman1234 ,
Checked on the user's guide starting from page #121. Make sure the followings:
- All memories must be matched in size, rank, and organization (ideally to be identical memories, same brand and model). If any of the 3 components not matched, system will not identify it as useful, as well as it's partner in pairs.
- Only the DIMM_1-4 slots (the slots with the white securing clips) on the system board can be used with the riser cards. The other slots (DIMM_5-8) must be left vacant.
- Further checked on the Spec Sheet. It stated that "1KW chassis required for memory expansion greater than 32GB (greater than 8 DIMM slots)." Make sure you memories and PSU match with this requirement.
- A discussion here pointed out whether memories in dual-rank or quad-rank may make a difference. Not sure if it's correct but check what kind of yours first.
- All memories must be matched in size, rank, and organization (ideally to be identical memories, same brand and model). If any of the 3 components not matched, system will not identify it as useful, as well as it's partner in pairs.
bmcowboy
4 Apprentice
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573 Posts
1571
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Posted February 5th, 2019 18:00
Hi @rbowman1234 ,
Check out this thread with solution and see if same story as yours.