2 7850s vs 1 R9 380?

[Conner_1]

I plan on buying an R9 380 and was just curious as to if I should crossfire it with my older 7850 card or just replace the 7850 with the R9 380. The R9 380 has 4 GB of v-ram and the 7850 has 2 GB of V-ram.

Processor: i7 3770K
PSU: 600 Watts

 

[Brunostako]

Take the R9 380 4GB. 2 HD 7850/R7 265 won't have a consistent performance like a single GPU.

 

[sammy sung]

Pretty much what was said above.

Dual 7850 2GB cards even at 1080p can be limiting in multiple areas. I've used crossfire and SLI for every tower I've ever owned save one, and I can't honestly recommend it for anyone, aside for some very unique circumstances. You'll deal with screen tearing, microstutter, no crossfire/sli support games, very very little support games, limiting 2GB even at 1080p can hit your minimum frames pretty hard. And the most upsetting is the wide array of scaling. Some games scale amazingly, almost giving you the double performance most people mistakenly believe they'll always get with dual cards. Others give you a relative 10-15% performance increase, but in tandem with all the issues I listed above.

Some games simply don't utilize the second card at all, and will often run worse than if you had sli/crossfire disabled.

tl;dr

Go with the single most powerful card you can afford.