media graphics card upgrade instructions

https://www.dell.com/support/manuals/en-us/xps-8940-desktop/xps-8940-service-manual/removing-the-graphics-card?guid=guid-5ee4d18f-bd5b-40f1-9d7a-a0af350c99e1&lang=en-us

https://www.dell.com/support/manuals/en-us/xps-8940-desktop/xps-8940-service-manual/installing-the-graphics-card?guid=guid-0d4dc532-5e97-406d-ae65-a5ced82c4fba&lang=en-us

Keep in mind you probably have to disable Secure Boot in BIOS setup before installing any after-market (non-Dell) GPU. Otherwise, the PC won't boot...

To upgrade your graphics card:

1. Check compatibility.
2. Backup data.
3. Uninstall old drivers.
4. Power off and disconnect.
5. Insert new card.
6. Connect power.
7. Boot up and install drivers.
8. Verify installation and test performance.
9. Update BIOS/UEFI if needed.
10. Dispose of old card responsibly.

This is visual guide with step by step how to replace the graphics card on XPS 8940.  Including suggested videos for other components replacements. 

@RoHe​ I can 100% confirm that if you buy the PNY GPUs directly from Dell, you don't have to disable secure boot it works fine.   I tested that and it booted just fine with secure boot enabled. 

They are not Dell Branded. 

Of course, if Dell sells the GPU, it's going to be listed in the database so it can be used without disabling Secure Boot.

@RoHe​ I mean the PNY branded cards Dell sells on their website, the same GPU you could roll up in a Best Buy and pay for. They are not Dell branded, but they work with secure boot enabled. TBH they are about 100 dollars or more cheaper than anywhere else.  It's more for if people are looking for an upgrade The GPU's Dell sells even if they are not DELL branded. work with secure boot. 

The only thing is the measure, these cards are quite a bit longer than the DELL Branded GPUs.

I guess they could get them listed since they are selling them.  Just a good thing to know if you want to upgrade your GPU, and don't wanna worry about having to disable secure boot. 

Like I said, the ones Dell sells likely can run with Secure Boot enabled, but that doesn't mean the ones from the big box store will also run with Secure Boot enabled, unless PNY paid the big bucks to Microsoft to have all their cards/drivers signed to allow them to run with Secure Boot enabled. 

Do the PNY GPUs Dell sells have exactly identical specs as the ones at the big box store, including number/types of ports, RAM, fans etc, etc? 

@RoHee​ From what I can tell they are 1:1 Identical.   If I type in the part number it comes up on more then just Dell's website.