king3pj :
Coming from EVGA SC 970s in SLI that typically got to 76-77 C under load I am really impressed with the G1's cooling.
Out of curiosity were your SC's the reference cooler design? My first 970 was a reference cooler SC Gaming (model 04G-P4-1972-KR). I wound up selling it and getting two ACX 2.0+ SSC variants for SLI (model ends in 3975) as the regular SC and ACX SSC would not SLI (EVGA issue). That SSC GPU in solo ran nearly 10C cooler under load with the same Afterburner fan profile than the reference cooler SC.
It was something like 62C vs. 70C. Granted the SSC ACX 2.0+ had a new heat pipe design over the older 970 ACX 1.0 cards which also ran cooler than the reference blower cooler, but it was still a huge difference.