I already tried pulling all the RAM from the system and using two different sets of 8GB modules (in pairs) from two different manufacturers, trying 2 sticks in all slot combinations, and the only ones that work are the original Hynix (from Dell).  Dell gave me a model number for RAM they say is correct, and it appears to match the specs of what we bought from both Corsair and Samsung (which didn't work)... no idea why.  This is what Dell says I need:

Dell Memory Upgrade - 8GB - 1Rx16 DDR4 UDIMM 3200MHz

Can't see any difference between this and what we bought.... unbuffered , non-ecc... 1.2V, CL22.

Seem to match may be the problem as Dell systems are touchy about mixing RAM manufacturer types. This warning ( Different Memory Vendors mixing within a channel is not allowed and it would cause memory speed down to 2666Mhz or below) on the spec page lends some credence to the fact. The ideal solution is to replace all 8 GB RAM modules with a 32 GB RAM kit from Crucial which is the most compatible RAM for Dell systems. That can be found here.

Hi, 

This is Geoffrey. I have replied to you via a Private message. 

I am having the exact same issues with my brand new precision 3650.  I also tried 1.2v and 1.35v ram sticks, and nothing happens.  Just a blank screen.  Is there a solution yet to this issue?

I have the same problem, I buy 2 the same systems with 16GB RAM. One computer working fine, second when I put 4 x 8GB RAM modules not start. System restarted but screen is black. I try use other modules from first system but the problem is in my opinion on motherboard. Do You have any idea ???

In order to get a qualified help, first you should fully understand your specs, and second share them here. Down to the last letter in component numbers.

Good luck

P.S.

>Dell Memory Upgrade - 8GB - 1Rx16 DDR4 UDIMM 3200MHz

1Rx16

>unbuffered , non-ecc... 1.2V, CL22.

Are you sure you have unbuffered in your machine?

Mixing is forbidden.. you may have already fried your controller, so some slots my be already disfunctional.

BTW, that sold in retail, particularly by Samsung is oriented on "enthusiasts" who voluntarily take the pain on their, when dealing with overrated SPD. The RAM that Dell installs may seem not very fast, because they use enterprise class modules which pass very different QC, and have guaranteed SPD record with wide tolerances. Unfortunately, this allows DELL engineers making cuts on circuitry and memory bus (BIOS) tweaking, making retail products working worse.

Anyway, lets see while you read out your full specs aloud.

If you go to Crucial or any of the other memory vendors you can search for RAM compatible with your system. RAM slots are in banks - the ejector tabs identify the bank. So if you have 4 ram slots two with white tabs and two with black, install identical memory in both white slots, and identical in both black. Do NOT mix ram types in the same bank...

I added two Crucial DDR4 UDIMMs (the 32GB kit is 2x16GB p/n CT16G4DFD832A) in my Precisioin 3650 and it works without any issues at all.

Hi Geoffrey,

i have the same problem like CambrixGroup, maybe you can help me also? Or does anybody else has already a solution? I have a Precision 3650 with i7-10700 + 8GB RAM U-DIMM (PC4-3200AA)
And now i would like to insert 4x 16GB U DIMM PC4-3200AA, but it doesn't work. Just the memory error code signaled.

I have upgraded to 32GB x 2 DDR4 3200 Adata without problem.

T3650 i5-11500 + Adata DDR4 3200 32GB x 2.

Did you try swap the memory stick?? maybe ram stock faulty