[NAME]  Yes, when you install any non-Dell GPU, you have to disable Secure Boot in BIOS setup. But that's not a problem at all. You will have to disable Secure Boot before you swap GPU cards.   You can buy any brand of retail GPU that (a) physically fits inside your PC's case and (b) doesn't require a PSU larger than the one in your Inspiron 3670, which is either 290W or 365W. The PSU size limits your choices and it can't be upgraded. Also, I don't think either of those two PSUs has a PCI-e power cable that goes directly to the GPU, so that eliminates any GPU which needs that extra power connection. There are quite few threads about installing a retail GPU in the Inspiron 3670. So have a read.
I would like to get clarification regarding video cards for the Inspiron 3670. As I understand, if you do not use one of the five / six Dell NVIDIA GeForce video cards identified / shown in the 3670 specifications, then any other video card used is defined as NON-DELL regardless if the manufacturer (MSI, EVGA, PNY, Gigabyte, etc.) of the card makes reference to the Dell part number (e.g. 8CCF1, 24K8H, DVP9W, etc.). If a NON-DELL card is used, then it is mandatory to disable the Secure Boot in the Bios. If not then PC will not boot. Also, does anyone know of a vendor for any of the Dell NVIDIA GeForce cards (at a reasonable price)? I have located cards that reference the Dell specifications (e.g. GeForce GTX 1030 or GeForce GTX 1050) but none mention that it is specifically a Dell NVIDIA GeForce card I will definitely appreciate an answer regarding the clarification question as well as any vendors / suppliers for the Dell NVIDIA GeForce cards.
Inspiron 3670 - Video Card Clarification