HEVC Video editing/playback - Quadro P400/600 or Geforce (1050GTX)

So, it’s definately going to be option 1. No money for a $$$$ modern build.

Also, I managed to find answer to one of my key queries - that PCiEv2 ‘bottleneck’ imposed my the older P6T6 WS X58 board. Several sources confirm I ll be fine with not having a PCiE v3 lane to go with a modern GPU i.e.

http://www.tomshardware.co.uk/answers/id-3248140/gtx-1050-pcie.html

https://forums.geforce.com/default/topic/1018857/geforce-1000-series/will-a-pcie-3-0-graphics-card-will-work-on-a-pcie-2-0-slot-/post/5187854/#5187854

All of these, obviously refer to gaming performance and not video editing (which is what I need this budget build for). And all benchmarks involve GeForce based GPUs. Can i safely assume that Quadro based cards won’t be affected by the PCiE v2 limitation my mobo imposes?

Still, my question regarding the Quadro P400/P600 vs the 1050/1050Ti remains. Since I m in favour of the Quadro at the moment, and I m looking at similar prices for both, is there any reason (other than slightly better gaming performance) to go with the 1050GTX or Ti? Wouldn’t the Quadro outperform the 1050 in terms of video editing/encoding/decoding (4K HEVC and 2K)? Isn’t supposed to be build for such type of tasks?

I m also confused as to why a 1050 has 640 cuda cores - which is nearly double from what the P600 has (384)…?