It would help if you posted the exact model number otherwise that is impossible to answer.

Assuming you are working with a single CPU configurations.  The following table illustrates the memory configuration and population rules for the Dell Precision Tower 7820, go to the link for a larger view:

Clear CMOS via jumper to see if it may help.

@JOcean​ It is a 7820 as my name implies. Single X6230 with 6 slots. 3200 speed ram. Every piece of ram will run in the 7820 in any order as long as I only use 4 sticks.

@Chino de Oro​ I haven't pulled the jump, but I have use the bios reset inside of the bios utility to set it bac to factory and also to the latest bios setting.

@My 7820​ Sorry my bad, as I was not sure if that was a reference to your system.

@JOcean​ I edited it. :-)

@bradthetechnut​ 

Well sir, I do believe that you figured it out. I removed the CPU and best I could tell there are some bent over pins.

Not being one to give up I attempted to straighten them. Now it only reads 3 sticks of ram. lmao

I guess I'll get another motherboard or else just accept it only runs 96gigs now and stop fooling with it. I wanted to use it for video processing, but instead may get another unit and just use this one to surf the web? I have a Xeon Silver 4114 and a couple sticks of 8gig ram I can put in it for that purpose which should work just fine.

Thanks for your expertise.

David

@My 7820​ 

One can always take a photo of the socket and expand it to see the pins, but it looks like you got it.

Thanks for the accepted solution.  I was definitely hoping you were going to have better luck with it.

@Mi 7820 Enderezar los pines doblados del zócalo es un trabajo para hacer con una buena lupa fija con luz y herramientas tales como un aguja con el ojal cortado en forma de garfio sujeta en el extremo de un lapiz para poder mover delicadamente los pines desviados y devolverlos a su sitio. Me pasó con una placa base de IMAC de 2013 que solo reconocía 2 módulos RAM y era por varios pines doblados en el zócalo de la placa base que no hacían contacto correcto con el procesador. Los doblé al corregir la posición del procesador en vez de colocarlo perfecto a la primera.