jin_mtvt :
de5_Roy " ONLY NEEDING SINGLE 6 PIN " ??? what exactly are you trying to suggest here ??
both gfx cards can run on lower wattage psus but deliver a lot of performance without needing much power.
AnEwG :
The HD 7850 needs 2 6 pin connectors but that gives it a higher headroom for overclocking (I think). while the R7 265 has lower power consumption and slightly better performance than HD 7850 when they are both at stock.
radeon hd 7850 had single 6 pin pcie connector. radeon hd 7870 had 2x 6 pin power connectors.