the 7850 is released in 2012 and r7 265 in 2014 so its newer technology with better cooling and higher clocks as i said before it doesn't matter if your GPU is a tight or loose fit in your case what matter is the case air flow and ventilation..
there is no mention of how long gpu ur case fits and if u have a 300watt of psu then pls upgrade it to a 500 watt , its better to change your case along with your psu if its possible ...
its 550W ALREADY I changed it. but the r7 265 gpu says it has awesome heat cooling system. two fans. two heat pipes. The heatsink has 2 aluminum blocks and 2x copper heatpipes to dissipate the heat. That is good enough even if it is close eh?
the 7850 is released in 2012 and r7 265 in 2014 so its newer technology with better cooling and higher clocks as i said before it doesn't matter if your GPU is a tight or loose fit in your case what matter is the case air flow and ventilation..