XPS 8940, upgrading GPU to GTX 1660 Ti

What PC do you have? What specific GTX 1660TI graphics card?

Sure it's a power issue? Does your PSU have a PCI-e power cable (6- or 8-pin) that goes directly to the GTX 1660Ti, and did you connect it? (Depending on what connector the PSU plug has, you might need a short adapter cable.)

Did you disable Secure Boot in BIOS setup before installing the new card?  Drivers for most "after-market" GPUs can't be loaded when Secure Boot is enabled, so the PC refuses to boot. 

Remove the new card, and if you have an onboard Intel Graphics port that matches what the monitor uses, connect the monitor there. Otherwise, reinstall the old GPU. Then reboot and tap F2 to open BIOS setup. Disable Secure Boot, save the change and exit. After you get back to desktop, shut down normally. Now swap in the GTX 1660Ti (don't forget to connect that PCI-e power cable) and reboot.

They have an out of warranty XPS 8940. Shipped with 360W PSU and no video card.

nVidia recommends a minimum 450 watt PSU for the GTX 1660Ti FE and it uses 1 PCIe 8-pin connector.

Will still have to disable Secure Boot in BIOS setup before installing an "after-market" GPU.

@RoHe​ I have the ASUS TUF OC edition and a dual width slot its  got an 8 pin PCI power connector aswell

The other question- what is the BIOS setup Secure Boot?

information about  Secure Boot

Bottom line = In most cases, you have to disable Secure Boot when a non-Dell GPU is installed. Otherwise its driver won't load and PC won't boot.

So be sure to make that change before you install the new card. Reboot and tap F2 when you see the Dell screen. Find and disable Secure Boot. Don't make any other changes. Just save the one change and exit setup. PC will automatically boot to desktop.

Shut down normally in Windows and swap in the new GPU.

@RoHe If i do this and upgrade to the 500w psu it the pc should work with the GTX 1660 Ti?

I am trying to use a GPU I got for Christmas and have a PSU issue. I dont know much but i know i have a i7 10700 CPU. I am not sure what to do with my PC right now. Should I increase to 500w or is that still too low? (I currently have GT 1030)

 

If this is the exact GTX 1660 TI card you have, they recommend a minimum 450W PSU, so a 500W PSU should be ok...

@RoHe​ Anything PNY won't require the secure boot to be disabled, I  also tested with the 40 series bought from Amazon directly which means DELL would not have known about the GPUs.  Also bought a few after-market market GPUs from Dell 0 of them required a secure boot disabled; 3060, 3060 Ti, 4060, 4060 Ti to 4070 and 4070 super.  Also, Note that the SKU numbers from Dell for their aftermarket GPUs are the same SKUs that other retailers use. So there is nothing different with them. 

This may have been a problem that plagued 10 series cards, but 30 and 40 series 100% do not require it to be disabled. 

I may go back and use a few test bench 10 series cards to test with, but Nvidia is about done with 10 series, so it may not even be worth checking.  

I just wanted to point that out, us telling everyone that updates their GPU to just disable secure boot because it was the norm in the past.  Kinda just opening them up to security vulnerabilities. It may just be better to advise if they are having issues booting with the new GPU installed please test by disabling secure boot.  Instead of outright telling them to disable secure boot. 

IMO, better to warn users about Secure Boot, rather than wait until PC fails to boot with new GPU installed.  Once they know the PC boots and new GPU properly with Secure Boot disabled, they can always re-enable Secure Boot and see what happens...

@RoHe​ Thanks, in the context more of hey you may have to disable secure boot, or Hey please disable secure boot to install the card and update the drivers once installed please try and run the system with secure boot enabled, if it does not post you will have to disable this feature to use your aftermarket card. 

I wasn't trying to pick an argument just us telling them to blanket disable secure boot as the norm feels like it's opening up to a host of other issues.