4x2Gb RAM in Dell Precision T1500, only seeing 4Gb

Bit Baby

4x2Gb RAM in Dell Precision T1500, only seeing 4Gb

I have 4x2Gb DIMMs newly installed in my Dell Precision T1500, but the BIOS (and OS, Linux 64-bit) are only reporting 4Gb.


DIMMs are all identical:



They all work individually.


BIOS (v1.0.1) reports them as DDR3 SDRAM Dual Channel, 133x10


The only way to get 4Gb is 2x2Gb in DIMM1 and DIMM3 slots (blue and black), which doesn't make much sense to me. Any other configuration is either ignored or won't boot.


Any suggestions?

3 Replies
Community Manager

Re: 4x2Gb RAM in Dell Precision T1500, only seeing 4Gb

@johnlevon Thanks for contacting us today. I am sorry to hear you've been experiencing issues with the Dell Precision T1500.  It looks like the issue may be caused because of the system requiring a BIOS update. I would suggest checking Dell's site for the latest BIOS. Please let me know if this resolves the issue for you or not. 



YogiH, Crucial Moderator, US

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Bit Baby

Re: 4x2Gb RAM in Dell Precision T1500, only seeing 4Gb

Well, I finally got around to upgrading the BIOS to Dell's latest (2.4.0), and it made no difference. No combination I can find will get the BIOS to see any more than 4Gb.

Upgrade Ace

Re: 4x2Gb RAM in Dell Precision T1500, only seeing 4Gb

I would blow compressed air across the memory slots in case they have some dust or dirt in them.  Examine the slots and pins  within the slot for any contaminants.   Make sure the DIMMs fully snap into place.


I would also unplug the computer and remove the CMOS battery for a while in case the BIOS settings have become corrupt.    Then I would reinstall the CMOS battery, enter the BIOS and load the defaults & reconfigure the date & time....Save & Exit then reboot again to check on the memory.   If the date & time are still correct, then you need to wait longer before reinstalling the CMOS battery.


I would then take one stick and try it in each of the slots.   I don't know if it will be recognized properly when installing out of order, but it is worth a try to determine if each slot is functional on their own. 


If you still have your original memory, reinstall it to see if it still works properly.  If it does, then keep it & try installing the new memory in the remaing slots.


Some people have mentioned removing the CPU and checking it for bent pins.   Some have had success just reseating the CPU.   Be very careful doing this if you've never done it before.   Sometimes the heatsink will pull the CPU out of the socket.   Sometimes running the computer first to heat the CPU may soften the heatsink compound and make it easier to remove the heatsink.   If you don't have any new thermal compound to use, then make sure to put the fan/heatsink back on in the same orientation.   (When the heatsink is removed, some of the thermal compound will stick to the heatsink & some will stick to the CPU.  If you don't refresh the compound, then you want to match it so the bare areas on the CPU match the area on the heatsink where the compound stuck.)   Also hold the CPU by the edges.   The CPU is keyed to only fit one way, so make sure it is oriented correctly or you will damage the pins.  Look at some videos as a guide.


Double check the labels on each stick and make sure they all match.  


Does the computer show any errors during POST or any error LEDs with all the memory installed?


If nothing works, it appears you may have a defective motherboard (or possibly CPU).