Check it out at the Dell site to compare. You can ask questions at the site. It's always better to buy directly from Dell if you can.

 http://www.dell.com/en-us/shop/dell-desktop-computers/new-inspiron-desktop/spd/inspiron-3670-desktop/fdcwgmmtcfl207s 

Here's the only manual listed-- 

http://topics-cdn.dell.com/pdf/inspiron-3670-desktop_service-manual_en-us.pdf 

Nvidia recommends 300w PSU however as soon as the system can output 75w off the PCI-E slot and the system combined power does not exceed the power supply rating a GT 1030 would work fine, In fact, I am using a GTX 1050ti on a Dell Optiplex 9010 that only has 275w PSU I have not had problems.

The Inspiron 3670 can use NVME M.2 drives

Max Ram is 64gb

The Dell site says max RAM is 32-GB, which would mean 2x 16GB, since there are only 2 slots for RAM, and that may be the max amount Dell qualified in this PC model.

"8GB, DDR4, 2666MHz; up to 32GB (additional memory sold separately)

You'd have to find out if the PC requires ECC (Error-correcting code) or non-ECC RAM first. Most home PCs use non-ECC RAM and I only see 32-GB ECC modules, which are extremely expensive.

And question was asked about the PSU size on the page I linked and somebody responded that it's 290W. There's no way to know how accurate that response is because we don't know if the post was made by somebody at Dell or somebody else. 290W would probably be ok for that video card.

For $850 you would be much better off with an Dell XPS x8900-1444BLK or  better.

https://www.amazon.com/Dell-x8900-1444BLK-Desktop-Generation-NVIDIA/dp/B015XK1SFM/

Much better performance and expandability.

Just received an Inspiron 3670 from Dell and it does have a 290W PS.  It also the 8 pin motherboard connector.

Have had the 3670 now for a month.  It does have a 290watt power supply.   I only have one complaint.  When you turn the computer on there is a loud pop from the speakers.  Doesn't do it at any other times.  I've run all the tests I can find.  Updated all the drivers twice and wiped the computer clean and reloaded and I cannot stop the pop.  It's almost like a capacitor unloading.  Other than that the computer works very well and if this was gone I would be completely satisfied.  If anyone has any suggestions they would be much appreciated..... Dewey.......

I have exactly the same "pop" when the computer goes on. I can't figure out how to get rid of it.

The Good news is 2 fold.  Its basically like a stripped down Optiplex 9020 / Precision T1700.  All of these models share the same 8 pin power supply in 290W and 365W optional.

Thats what I own. You can get a 365W power supply and a Short GTX 1050 TI or even 1060.  For Non Dell video cards WILL HAVE to turn SECURE BOOT OFF.  When installing an after-market graphics card into a Windows PC with UEFI secure boot enabled, the system may not boot.  This is true for ANY PC not just Dell.

http://nvidia.custhelp.com/app/answers/detail/a_id/3156

Dell OEM full height but short PCI-E video cards work 

365w PSU =
7VK45 365w, Huntkey
T1M43 365w, Delta

DVP9W Nvidia GeForce GTX 1050 Ti,  4GB, 75w
36V90 Nvidia GeForce GTX 1060, 3GB, 120w
24K8H Nvidia GeForce GTX 1050,  2GB 75w
8CCF1 Nvidia GeForce GT 1030, 30w
1MPR3 AMD R9-360 2GB, 75w
24K8H Nvidia GTX 1050 2GB, 75w

3840x2160 at 30Hz or 4096x2160 at 24Hz

Requires  HDMI 2.0

3840x2160 at 60Hz or 4096x2160 at 60Hz 

Requires Displayport 1.3

8MXMJ Nvidia GTX 750 Ti 2GB, 75w
0TC2P0  NVIDIA GTX 745 4GB , 75W
J27RG Nvidia GT 730 2GB,75w

Also Keep in mind the older 7XX series cards

Maximum HDMI Resolution: 1920x1200 60Hz
Maximum Dual Link DVI Resolution: 2560x1600 60Hz
Maximum VGA Resolution: 2048x1536 60Hz

There's some other issue. With the various CORE processors I3 I5 I7 etc the Memory controller is on the CPU not part of the motherboard.

The 9020 Mini Tower has 4 ram slots and 32 gigs is max according to crucial.

Same with Precision T1700 which is exactly the same thing.

http://www.crucial.com/usa/en/compatible-upgrade-for/Dell/precision-workstation-t1700-%28mt--sff%29

 Expensive Blades using DDR4 and supporting 2 X 24 core XEON processors have 24 Ram Slots and support up to 1.5 Terabytes of RAM.

We currently do 768 GIGS of ram on them with 32 gig Dimms.

Why is it always better to buy from Dell?