Question about hardware mining hashrate versus consumption

[kaydaryl]

Hey, currently pushing 170 Mhash/s with my old 5750 and am looking to expand soon. Based on some math I've done from the massive (and wonderful) hardware capability index, 2.66 Mhash/s/W seems pretty rigid.

While I've looked to increase my hashrate I've focused on finding not necessarily the fastest card but the most efficient. Can anyone help me decide which card I should purchase next? Currently thinking of a 7850

[GuiltySpark343]

Back in 2011 there was this review of performance/watt:
http://www.pcper.com/reviews/Graphics-Cards/Bitcoin-Currency-and-GPU-Mining-Performance-Comparison/GPU-Performance-Dollar

More up-to-date info on performance/J here:
https://en.bitcoin.it/wiki/Mining_hardware_comparison

[kaydaryl]

If that were updated it would help, but it isn't. I've done more research into J/Mhash for various cards and determined the 7850 is by far the most cost-effective. I can post excel numbers if anyone wants to see.