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Last reply by 06-20-2022 Solved
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3 Silver
1325

XPS 8950, DIMM1 won't recognize Crucial 32GB DDR5

Hi all,

I have a new 8950 i7-12700, it was ordered with the minimum 8GB of DDR5 as I already had a 64GB kit of Crucial DDR5, 2x CT32G48C40U5.  This ram is validated in on the Crucial site for this system.  With just the OEM shipped 8GB stick in DIMM1, no issues.  If I try to add the 32GB Crucial sticks I can only get the MB to POST or BOOT if I use any other slot than DIMM1.   That is, if I use DIMM1 only with a single 32GB stick or with a second 32GB stick in any other slot (DIMM2,3,4) no go.  I only get a flashing white/amber power light (two blinks white, two blinks amber).  I can however, use DIMM2 and 3, or 2 and 4 or 3 and 4.  Just cant use slot 1.

I am also noticing some instability once booted with random blue screens with the two 32GB modulus, in this case slots 2 and 4.  Default BIOS settings, the 32GB sticks do show up in the BIOS and via CPUZ correctly.  I suspect there is a problem with DIMM1 and this is leading less than optimal configuration using the other slots resulting in the instability.

Has anyone else been able to run 2x 32GB sticks in the 8950?   If so, which slots are you using?

Solution (1)

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3 Silver
1072

I cant find anything wrong with the replacement system despite the initial impressions. The RAM works great, where as it did not in the original system.  I cleaned up the wiring, fixed the chipset heatsink and I'm sure its working even better now with thermal past rather than the TIM.  Fit the Be Quiet TF2 in place of the stock cooler, added back the NVME's and SSD.  Cloned over the supplied 256GB NVME to the 2TB and swapped it out.  Its working well, but Dell is still going to hear from me on Monday.  Did some FAN work as well.  Not sure I want to go through this again and wait another 2 to 3 weeks on another gamble.  Ill post another thread on the CPU Cooler alone, once I talk to Dell on Monday.

 

Here are some photos after some cleanup.

IMG_3721.jpgIMG_3714.jpgIMG_3717.jpg

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Replies (16)
7 Gold
986

That blink code shown here, indicates a BIOS ROM failure which makes sense. You could try pulling the CMOS battery for 15 minutes or so then reinstalling. If that does not help then a call to Dell tech support may be in order. The fact that the DIMM slot does not detect the 32 GB RAM could be a MB fault. But also very possibly a BIOS error as the blink code indicates.

As for which slots match the colours, both white then both gray.




-Forum Member since 2016
-I do not work for Dell
-A user helping other users
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Gaming on a home built with GIGABYTE B560M DS3H AC budget build with an i3 10100
Real work on a Latitude E5430
967

Thanks JOcen,

Pulled the power and the CMOS battery (for at least 15 min).  No luck, it still does not like the 32GB stick in slot 1.  By the way, I was wrong with the code in my first post, the code is 2,4 and per the service manual that's "Memory or Random-Access Memory (RAM) failure".  Since these are two brand new sticks and the result is the same with either in slot1, however the system recognizes and boots with the RAM in the other slots, I am leaning toward a MB issue.  It can happen I guess

I already have a case open with Customer Care, I was upset the box arrived with a good size ding and scraped paint on the top of the case, no damage to the shipping box however.  The internal wiring was also all over the place and found a 4pin power plug stuck in the CPU fan (shaking head).  I re-ran all the wires and cleaned it up.  If I didn't have the RAM issue I would just keep, but I think I will take them up on sending me a replacement system at this point.

962

I have to agree that the MB sounds like it has a problem. No problem with the blink code mistake, your 2 - 4 sounds more logical. And no reason to keep it with the dings and wiring haphazardly located. Once this gets sorted out , if you could update the post as we all like to see the end result.




-Forum Member since 2016
-I do not work for Dell
-A user helping other users
-If you like an answer please click on thumbs up
-If a reply is a solution to your problem please click on Accept as Solution
Gaming on a home built with GIGABYTE B560M DS3H AC budget build with an i3 10100
Real work on a Latitude E5430
3 Silver
953

Will update for sure.  I already had some nice parts laying around, pair of 2TB NVME drives and the 64GB of RAM.  So it was ordered with the min SSD and Mem. I was going to look into a better CPU Cooler but that will be later after I get the RAM issue sorted out.  Once I got the wires re-organized it looks really good inside.  Here is a after cleanup photo for reference.  Its hard to find an 8950 non AIO photo.  The non-k CPU cooler really needs to be upgraded if you ask me.

IMG_3667.jpg

10 Diamond
951

@dstewart51  No offense intended, but how are you numbering DIMM slots, by the numbers printed on the motherboard or...?

You should put your new matched pair in 2nd and 4th slots, counting from the CPU. The one closest to the CPU is DIMM3. So counting from CPU: DIMM3>DIMM1>DIMM4>DIMM2.

Ron

   Forum Member since 2004
   I'm not a Dell employee

921

@RoHeNo offense taken, its a reasonable question.  I listed the slots as numbered by the MB, DIMM1 and 2 being white, 3 and 4 black.  As shipped, there was a single 8GB stick in DIMM1, this is the slot that wont recognize the Crucial 32GB stick (CT32G48C40U5), all other slots do.  Here is a photo  I took during my first attempt with the 32GB sticks in DIMM1 and DIMM2 (white slots).

66630499733__3A43944E-79A7-4AC3-813B-D9D40094B88F.jpg

10 Diamond
906

@dstewart51  OK, just trying to cover all the bases...

Did you order this PC directly from Dell on line or from somewhere else?  Could it have come from Dell's outlet store?

Sounds odd that it's scratched and the wiring was in a mess. You might want to ask them to replace the entire PC with a new (not refurbished) system, instead of just the motherboard...

Post back and let us know what happens...

Ron

   Forum Member since 2004
   I'm not a Dell employee

902

Directly from Dell, brand new, custom configuration.  I suspect I just got unlucky with whom ever assembled it.  Dell already offered to replace the entire box with a new, exact build.  I'm going to take them up on the offer.  The dent and scratch I wasn't happy about but could get over and live with, I was disappointed about the wiring but I corrected. They say about 8 days for a replacement.

3 Silver
873

I spent some time on the phone with Dell Tech Support to double check this ram and configuration is supported.  The RAM is supported, two sticks are supported, but NOT IN SLOT 1.  They are telling me, DIMM1 one can only accept 8 or 16GB sticks at 4400MHz and I should use DIMM3 and 4  for both of the 32GB sticks.   Something is not adding up in my mind.  The MB is spec'd at 128GB, 4x 32GB albeit at 3600MHz, but my 4800MHz should work at the lower frequency and the MB should auto select the max capable speed.  They dont layout the specific memory configuration per slot in the available manuals, only it should work.  I would sure like to hear if anyone else has tried 2x 32GB sticks in their 8950.

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