This is not a Gigabyte vs EVGA comparison, but a mining comparison of Hynix vs Samsung memory.
Most people try to stay away from the Nvidia graphics cards using Hynix memory, as their hashrates while mining Ethereum are lower. While that is true, almost every other mining algorithm ranks just as high or higher than a similar card using Samsung memory.
For this comparison I am using an Nvidia EVGA 1060 3GB with Hynix memory, and a mini Nvidia Gigagbyte 1060 3GB with Samsung memory. I ran both cards through the same benchmark of algorithms using the cards straight out of the box with Stock settings and no overclocking. As you can see, out of 24 different algorithms, the Hynix only fell behind in Scrypt, Ethereum, CryptoNight, and Blake 2b. If you mine anything besides Ethereum, the Hynix memory cards are great mining cards.
Here are some benchmarks using similar overclock settings. The settings I used were found by increasing the overclock values in MSI afterburner to a point high enough that they would run continuously without fear of shutting down or freezing up. I ended up with a core clock of +122MHz on the Hynix and +167MHz on the Samsung. The memory clock settings were +488Mhz on the Hynix and +431MHz on the Samsung.
Although overclocking your cards will get you a better mining hashrate, I have found that turning the power limit and temperature settings in MSI afterburner down will lower the card temperature by a large amount, while still giving good mining hashrates. I ended up using the same core clock of +122MHz on the Hynix and +167MHz on the Samsung as used above. The memory clock settings were +488Mhz on the Hynix and +431MHz on the Samsung, also the same as above. I liked turning the power setting down to 65% and the temperature down to 67C. This way the cards run cool, draw very little power, and still get very good hashrates per watt.
