Tesla GPU Bitcoin mining
There are two technical differences I know of between the brands, when you comparing similar cards.
1) Nvidia cards tend to have better double precision FLOPS than AMD - by a factor of 2 sometimes. AMD usually does better for single precision FLOPS.
2) ECC memory is available for both brands for the GDDR5 memory. The difference is that Nvidia uses ECC on the internal memory (registers and such) as well, where AMD does not.
In my opinion, choose the card based on your application. If you use more single than double precision, go AMD, otherwise Nvidia. If you need the ECC for high fault tolerance, maybe Nvidia is your best choice. Sometimes many cheaper cards does better than 1 or 2 top of the line cards - think of PCI-e bandwidth. Read up on benchmarks, and try to determine which card is best suited for your needs.
Source: stackoverflow.com
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