RAM module not fully seated in the LPDDR5x slot — common after the laptop has been transported or serviced
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BIOS not detecting new RAM after an upgrade — upgrade may require BIOS memory training pass
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Incompatible RAM speed or timing — the Precision 5690 with Core Ultra 9 185H requires LPDDR5x-6400 rated modules
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Windows Task Manager reporting less RAM than installed — reserved hardware memory allocation in BIOS
Fixes
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Reseat RAM modules: Power off the Precision 5690 completely. Remove the bottom panel (Torx screws). Locate the RAM modules and press each down firmly until both retention clips snap into place. Replace the bottom panel and power on. Verify total RAM in Settings > System > About.
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Clear CMOS via BIOS: At startup press F2 to enter BIOS. Go to Maintenance > Data Wipe or look for Reset NVRAM. On some Precision models, this forces a fresh memory training cycle that recognizes newly installed or reseated modules.
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Update BIOS: Visit Dell Support with your Precision 5690 service tag and install the latest BIOS. BIOS updates for Precision models frequently include memory controller improvements for LPDDR5x compatibility and recognition of higher-capacity modules.
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Check BIOS Memory Map: Press F2 at startup and verify the BIOS reports the correct total RAM under System Information. If BIOS shows less than installed, the module is physically not recognized. If BIOS shows correct amount but Windows shows less, adjust Memory Hardware Reserved in msconfig > Boot > Advanced options.
“After adding a second RAM stick to my Precision 5690, it showed only 16GB instead of 32GB. A BIOS update and forcing memory retraining by clearing NVRAM fixed the recognition issue.” — Fadzilah Mohamad, CAD engineer
Frequently Asked Questions
About the Author Ryan holds a Computer Science degree and has spent over 15 years troubleshooting Windows hardware and driver issues across major laptop brands. He writes practical, step-by-step guides for everyday users at softwaredriverdownload.com.
Why does the Dell Precision 5690 not recognize all installed RAM?
Common causes include a RAM module not fully seated, BIOS needing a memory training cycle after new modules are installed, incompatible RAM specifications, or a BIOS issue with LPDDR5x recognition on the Core Ultra 9 185H platform. Reseat the modules and update BIOS first.
What type of RAM does the Dell Precision 5690 use?
The Dell Precision 5690 with Intel Core Ultra 9 185H uses LPDDR5x-6400 memory soldered to the motherboard in most configurations. Upgradeable configurations exist with SO-DIMM slots depending on the specific SKU purchased. Check your service tag on Dell Support to confirm your configuration.
What is the maximum RAM capacity of the Dell Precision 5690?
The Dell Precision 5690 supports up to 64GB of RAM in configurations with upgradeable SO-DIMM slots, or up to 64GB in fixed LPDDR5x configurations. Specific SKUs vary, so confirm the maximum supported by your unit via the Dell Support service tag lookup.
Can I upgrade the RAM in the Dell Precision 5690?
It depends on the configuration. LPDDR5x models have soldered RAM that cannot be upgraded. Models with SO-DIMM slots allow upgrades, but only with Dell-approved LPDDR5 or DDR5 modules. Using third-party modules not validated by Dell may cause instability or non-recognition.
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