#1804
I'm not sure which part of "does the same" poses a problem to you.
The RX 460 is significantly faster than the 750 Ti.
#1805
I can understand the cases and PSU then.
Stream on a second monitor should actually be getting decoded by the GPU, not the CPU. Current GPU?
What's the 2500K running at? I still have to check which games would even benefit from Hyperthreading. The problem is that 6700K benefits more from it so those nice +50% you get in Cinebench on stock clocks won't really happen. 10-15% is more like it (+20% IPC but lower clocks).