OptiPlex 780, rejection of random RAM (same modules, diff in heatspreaders)

I got a Dell Optiplex 780 (SFF), which came without RAM, so I tested with a pair of sticks of 2 x 4 GB I have (CMZ8GX3M2A1600C9). It started no problem, everything worked well, so I've gone ahead and ordered the identical set, but with Low-Profile (CML8GX3M2A1600C9) because the first together that I tested with large heatspreaders and wasn't when the case was closed.

The Low-Profile game is tested and works on another machine, but if I put them in the Optiplex 780 it does not start. I get the beepcode 1-3-2 (RAM not detected, I think it was).

I don't have advice, troubleshooting, such as:
-Reinstall the modules of
-Exchange places with the modules
-clear CMOS
-etcetera

All this and much more, of course, accomplished. There is nothing wrong with the modules and the motherboard works with the same EXACT modules, the only difference is the appearance of the modules.

I accepted that I have to choose a set of Crucial, I have nothing against was just that I could get this set for a decent price and it should have worked, I just want to know WHY it does not work in view of all the works of heatspreaders just fine and dandy.

It does not work because the modules are 4 not compatible rank of high density ram.

Tags: Dell Desktop

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