Problem with RAM upgrade on Precision 3660 Tower

The issue is that on the Crucial site, the configurator offers that kit for a Precision 3660. 
So either the configurator is wrong, or the kit has a module faulty inside

I've choosen this ram because crucial site says it's compatible

https://www.crucial.com/compatible-upgrade-for/dell/precision-3660-tower

@TS-DELL , try one module at a time as the only one installed in dimm slot 0... with a bit of luck one will allow to boot (this to check if one is faulty)

I tried each single module, but no one worked.

What to do, will crucial replace the kit with a working one? On crucial site the kit is named as compatible...

It's very annoying.

I think Dell will not do anything about it. I sure they say'll "buy our original ram".

At this point I would say yes. Give them the computer model and the part number of the kit that their own site offered you as compatible, and let them fix the issue

FYI; I was in contact with crucial support. They gave some tips to fix the problem (cmos reset) but it doesn't work. They checked the compatibility again and confirmed that it should work. Now I can send a RMA request to crucial. But before this I'll try to replace the kit by vendor.

Uhm, i don't think the kit of the OP and yours , @MWC Tech , are ecc . In any case the i7-12700k should work with either ecc or non ecc modules, and the brochure of the 3660 states the option of using either ecc or non ecc ram.

Out of curiosity, could both of you write the p/n (dell and oem) written on the sticks installed at factory ?

I have the same issue. But with the 32GB Sticks by Crucial 32GB DDR5-4800 UDIMM
CT32G48C40U5. Not sure if this has something to do with ECC?

Thanks, so it's a normal udimm NOT ecc. At this point it's a bit puzzling

DDR5 16GB(density) x8 (organization), 4800 40-39-39 (speed) , UDIMM, 16Gb (die density), MPS 5100 (PMIC aka power management integrated circuit)

The kit you bought matches it, even if they give a bit less low level specs so I've no clue what PMIC is using. But density, organization speed , latency , should be a match

On some of the descriptions for this Crucial RAM it says "On-die ECC"

Mine was pre-installed with 2 x 16GB Sticks of
SK hynix 16GB 1Rx8 PC5 4800B-UA0-1010-XT
PN: HMCG78MEBUA084N AA

no other labels or dell part numbers on the the sticks of RAM

Factory Installed RAM

It may not like that the Crucial RAM has on-die ecc?  From the RAM Product write up it says: "Designed with on-die ECC (ODECC) at the component level for long-term stability"

So I'm going to return the Crucial RAM and try Kingston 32GB Sticks

Kingston PN: KCP548UD8-32

https://www.kingston.com/en/memory/search/model/104784/dell-alienware-precision-3660-tower

Mah, that should not be a factor. Plus the puzzling thing is that in theory Crucial tests its kits, I think

This is what I don't understand. I think crucial is a brand where you can be sure that the modules are tested and they'll work.

Now I returned my kit to vendor and I think they'll send a new kit. If this doesn't work I'll try to RMA it direct to crucial.

And that's what I don't understand too, unless there are counterfeits on the market...