[NAME]  [NAME]  [NAME]  RTX 4000 uses single SIX Pin  not 8 pin. Which is why I dont recommend RTX 2070 or RTX 2070 TI which uses 8 pin + 6 pin aka 375W.  If you scroll up further the 7810 he has clearly says 225W on the X16 slot aka max safe power use.  It also DOES NOT specify that you can use TWO cards aka the black X16 slot is wired X4 and says 25W max. The 625W unit has ONE six pin.   The 825W units come with a cable that has ONE 8 pin and ONE six pin aka 450W max power.  Changing cable or adding Y cables to tap aux PCI-E power from other places DOES NOT add power to your system.  It may fake out the unit so that it posts without error but FRY AND DIE is in your future when you push power supply beyond recommended safety considerations. Fry and Die also tends to KILL CPU, RAM, Motherboard, video card etc.  
Hi, I have a Dell 7810 with NVidia Quadro K4000. I used to have a NVidia GTX 460 on a previous PC (which I still have). This actually gives better resolution and a better quality picture than the NVidia Quadro K4000. I use the PC for graphics, photo's and work - so the question is what graphics cards would be an improvement and give me a better quality picture (I dont really need 3D rendering or CAD - just want really good quality picture for studying photos) My power supply is 685w and I don't want to change that, so I am pretty much looking for a better graphics card that I can swop out and will give reliability and will fit in the PC case. I am willing to spend, so not looking for a budget option or the cheapest, the quality of the resulting picture is more important, but hopefully several graphic cards options. Any advice appreciated.
DELL 7810 - UPGRADING THE NVIDIA QUADRO K4000 WITHOUT HAVING TO DO MODIFICATIONS