The rest of the mid- to high-range are not bad either at above 2.5 kHash/Ws while the three entry level are the last. The second is R9 290X and the 290 and the 7790 are close too at around 3 kHash/Ws. These results show us how efficient is every GPU and surprisingly no1 is the mighty HD 7990, almost in its own league. After dividing these values with the TDP we find the performance/Watt and in this case we are particularly interested in the kHash/Ws. I included the GFlops for the reference and you can see that both scale similarly. Some issues I had to correct like TDP of R9 280 is equal to 7950 B, for R7 260X kHash/s scaling +10% because not sufficient data and for R7 250X no data at all but its the same as 7770 and included for completeness. This was the most difficult thing to do, to understand those different results with different OC and finding the average results for each hardware and possibly for CGMiner. The mining performance kHash/s are an APPROXIMATION of the AVERAGE results with the hardware at default clocks and NOT a standard benchmark. GFlops perfomance (single precision) and the TDP in Watt are the official from wikipedia. Radeon Watt GFlops GFlops/W kHash/s kHash/Ws kWh/day kWh/mo Finally I put together a list with these and compared their performance vs power consumption as follows. So I gathered data on the litecoin website and wikipedia about the performance of the graphics cards and my conclusion is that GCN based GPUs are the best choice. OK, what really matters is the GPU but which one makes sense? As usual most people only care about performance and price but in this case the cost of electricity can easily be several times bigger. I really wanted to know which hardware is the most efficient for mining (litecoin more exactly not talking about bulldozers, piledrivers, excavators etc. After reading this article I couldn't sleep last night so I made an analysis instead.
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