I have indeed been having similar intermittent freeze issues with the non-free driver and have filed bug #696360.
Troubleshooting hardware issues is a routine part of my life in IT and your suggestion regarding heat is the first thing I checked to make sure that the linux driver was not somehow causing my card to overheat. The highest temp I can achive using my current software loadout is 53°C. Under Windows, the card regularly hits 65-70° when stressed. Strangely, I am never doing anything to stress the GPU when these crashes occur. I have no 3D-intensive software installed and the CPU & GPU % demands on modern hardware are relatively minimal these days. I can boot into Windows and run FurMark for hours without any issue on this hardware. It's been rock-stable for years under windows (my gaming paritition) and I use MSI Afterburner (formerly RivaTuner) to monitor fan speeds and temp. Here's my current temps: $ sensors coretemp-isa-0000 Adapter: ISA adapter Physical id 0: +34.0°C (high = +80.0°C, crit = +98.0°C) Core 0: +30.0°C (high = +80.0°C, crit = +98.0°C) Core 1: +32.0°C (high = +80.0°C, crit = +98.0°C) Core 2: +32.0°C (high = +80.0°C, crit = +98.0°C) Core 3: +32.0°C (high = +80.0°C, crit = +98.0°C) adt7473-i2c-1-2e Adapter: nouveau-0000:01:00.0-3 in1: +3.00 V (min = +0.00 V, max = +2.99 V) +3.3V: +3.30 V (min = +0.00 V, max = +4.39 V) fan1: 668 RPM (min = 0 RPM) fan2: 0 RPM (min = 0 RPM) fan3: 0 RPM (min = 164 RPM) ALARM temp1: +36.2°C (low = +65.0°C, high = +85.0°C) ALARM (crit = +97.0°C, hyst = +97.0°C) Board Temp: +34.2°C (low = +20.0°C, high = +60.0°C) (crit = +100.0°C, hyst = +100.0°C) temp3: +36.2°C (low = +80.0°C, high = +105.0°C) ALARM (crit = +107.0°C, hyst = +103.0°C) Thanks -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org