Benchmarking Defered Shading. But what is DS?

I get it that Deferred Shading runs at 60-100 fps with top'o'line Nvidia GTX boards . So it is not necessary to guess how DCS 2.5 with DS runs with 1080Ti, TitanXP, TitanXP Collector's Edition, TitanV (Volta GPU), Quadro P5000, Quadro P6000.

Now how about it performance at 2560X1440 or 3840X2160 with mid-range workstation boards using single panel with a single board.

Specifically

Quadro P4000

Quadro P2000

Radeon Pro WX5100

Radeon Pro WX4100

Or midrange gamer boards

GTX 1070

GTX 1070Ti

GtX 1060

GTX 1060Ti

Lower end

GTX 1050/1050Ti

GTX 1030

Quadro P1000

Quadro P600

WX 3100

Instant Action missions would do.

For me any FPS above 36 is great and acceptable.

48 and above is great.

60 and above is fantastic.

To me once sim or any game hits 48fps it is very playable.

Assume 2560X1440 1 screen or 3840X2160 1screen

Visibility range High

Deffered Shade ON

Shadows LOW or Flat Only

Trees and Grass 100%

Terrain Objects Default

Cockpit Global Illumination OFF

What is Deffered Shading engine? The look of DCS in 2.5 with DS is so different from 2.5 with legacy shading engine. There are new features such as how NVG work.

Is it Direct X 11, or DX 12, OpenGL, OpenCL, CUDA. CUDA is only on Nvidia. Radeon support DX11/12, OpenGL, and OpenCL , but no CUDA (obviously). Which benchmark 3D closely approximates DCS 2.5 with DS performance?

While my new home workstation will have Quadro P4000. It won't ship for three weeks. My existing one can be upgraded by replacing its older K4000 2GB board. Unfortunately, the 2012 vintage HP Z240 workstation cannot power 1080, or any board that draws more then 75W, and I have no desire to replace a power supply that is most likely proprietary to HP Z workstations. I beleive it is 400 or 465 watt. So my choices are limited in that regard. Otherwise the HP has been a really good trooper.

If I am overlooking or unaware of something basic, please point me in that direction.

Thank you.